JP2018066403A - Passage switching valve and vehicular heat medium system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new passage switching valve which can inhibit floating matters from entering into a space between an outer peripheral surface of a valve body and a tip surface of a seal member and being caught therein, and to provide a vehicular heat medium system using the passage switching valve.SOLUTION: A direction change part 15G which changes a direction of a vortex occurring downstream an opening edge 12E of an opening 14 formed at a valve body 12 so that the vortex flows toward a fluid flowing out from the opening 14 of the valve body 12 is formed at a tip portion on an inner peripheral surface 15 side of a seal member 15 which is in contact with an outer peripheral surface 12S of the valve body 12. The structure changes the direction of the vortex occurring downstream the opening edge 12E of the valve body 12 so that the vortex flows toward the fluid flowing through the opening 14 of the valve body 12, and thus floating matters are actively transported and discharged into the fluid flowing out. Therefore, the floating matters are inhibited from being caught in a space between the outer peripheral surface of the valve body and a tip surface of the seal member, and good seal performance is maintained.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a flow path switching valve and an automotive heat medium system using the flow path switching valve, for example, distributing cooling water for cooling a heat source such as an internal combustion engine or a lithium battery to various heat auxiliary machines. The present invention relates to a flow path switching valve used for this purpose, and an automotive heat medium system using the flow path switching valve.

  In general automobiles, the cooling water is circulated to the radiator to dissipate the heat of the cooling water for cooling the internal combustion engine to the outside, or the high-temperature cooling water is circulated to the heating device to heat the vehicle interior. For this purpose, cooling water is distributed to various heat auxiliary machines using a flow path switching valve.

  Such a flow path switching valve that distributes cooling water for cooling an internal combustion engine of an automobile to various heat auxiliaries is described in, for example, JP-A-2015-218775 (Patent Document 1). The flow path switching valve described in Patent Document 1 is a rotary valve that houses a valve body that is a cylindrical valve body in a housing in a rotatable manner, and switches the flow path according to the rotational position of the valve body. The valve is opened by overlapping the communication passage of the housing and the opening of the valve body, and the cooling water flowing in from the inlet is supplied to the various heat accessories of the automobile through the opening of the valve body and the communication passage of the housing. It is the composition which distributes to.

JP2015-218775A

  By the way, this flow-path switching valve is comprised from the hollow cylindrical valve main body and the housing main body provided with the communicating path which encloses this valve main body from the outer side, and is connected with each heat auxiliary machinery. A minute gap is formed between the distal end surface of the cylindrical seal member disposed in the communication passage and the outer peripheral surface of the valve body so that the valve body can slide. Phenomenon in which floating substances such as metal powder made of aluminum or iron contained in the cooling water intrude occurs.

  The floating substance that has entered may be sandwiched between the outer peripheral surface of the valve body and the front end surface of the seal member when the valve body rotates, and the contact surface of the valve body or the seal member may be damaged by the floating substance. For this reason, when the contact surface of a valve main body or a sealing member is damaged, the subject that a sealing performance deteriorates will arise as a result.

  Next, this problem will be briefly described with reference to the drawings. In the following description, a case where cooling water of an internal combustion engine is used as a heat medium is shown as an example. FIG. 10 is a cross-sectional view of the vicinity of the communication path of the flow path switching valve, and FIG. 11 is an enlarged view of the vicinity of the contact area between the valve body and the seal member.

  In FIG. 10, reference numeral 10 indicates a flow path switching valve, and the valve main body 12 is rotatably attached to a valve storage portion 27 formed in the housing main body 11. The valve main body 12 can be rotated around an axis extending perpendicular to the paper surface, and the communication passage 13 is opened in a direction perpendicular to the tangent to the outer peripheral surface 12S of the valve main body 12.

  Cooling water from the internal combustion engine pumped from the cooling water pump flows from the direction perpendicular to the paper surface and flows out to the communication passage 13 through the opening 14 formed in the valve body 12. A cylindrical seal member 15 is disposed between the communication path 13 and the outer peripheral surface 12S of the valve body 12, and the seal member 15 is a compression spring disposed on the end surface of the connection pipe 16D fitted into the housing body 11. 17 is pressed against the outer peripheral surface 12S of the valve main body 12 to be in fluid-tight contact. Note that FIG. 10 will be further described in the description of the embodiment.

  Here, as shown in FIG. 11, the axial shape of the inner peripheral surface 15S of the conventional sealing member 15 is linear inner peripheral surface 15S up to the distal end surface 15C contacting the outer peripheral surface 12S of the valve body 12. Is formed. The opening 14 and the communication passage 13 communicate with each other, and the opening edge 12E of the opening 14 formed on the outer peripheral surface 12S of the valve body 12 is located in the region of the internal passage 15P formed inside the seal member 15. Thus, when the cooling water flows out from the opening 14 to the communication path 13, the cooling water flows out as indicated by the streamline S.

  For this reason, a vortex Vr is generated in a space region formed near the tip of the inner peripheral surface 15S of the seal member 15 downstream of the opening edge 12E of the opening 14 formed in the valve body 12. Moreover, the vortex Vr tends to stay in the space region downstream of the opening edge 12E, and the suspended matter Dst mixed in the cooling water also moves in the space region downstream of the opening edge 12E according to the movement of the vortex Vr. Will stay.

  For this reason, when the valve body 12 rotates in the arrow R direction, a phenomenon occurs in which the floating substance Dst is caught in the gap between the outer peripheral surface 12S of the valve body 12 and the distal end surface 15C of the seal member 15. This phenomenon is explained when the discharge side of the cooling water pump is connected to the valve storage chamber 27 and the cooling water flows out from the valve storage portion 27 to the communication passage 13 of the housing body 11.

  On the other hand, there is a mode in which the suction side of the cooling water pump is connected to the valve storage chamber 27 and the cooling water flows into the valve storage portion 27 from the communication passage 13 of the housing body 11. In this case, the streamline S shown in FIG. 11 is in the reverse direction, and the floating substance mixed in the cooling water flows along the fluid streamline S, and the seal member 15 and the outer peripheral surface 12S of the valve body 12 It will collide directly near the contact surface and stay. Then, when the valve body 12 rotates in the direction of arrow R, a phenomenon occurs in which the suspended matter Dst is caught in the gap between the outer peripheral surface 12S of the valve body 12 and the distal end surface 15C of the seal member 15.

  Thus, in any case, the floating substance Dst mixed in the cooling water is sandwiched between the valve body 12 and the seal member 15, and the floating substance Dst causes the outer peripheral surface 12S of the valve body 12 and the distal end face 15C of the seal member 15 to be present. Will be damaged, resulting in a problem that the sealing performance is deteriorated.

  An object of the present invention is to provide a novel flow path switching valve capable of suppressing the floating material from being caught between the outer peripheral surface of the valve body and the front end surface of the seal member, and the flow path switching valve. The object is to provide a used automobile heat medium system.

  Here, the present invention is not limited to cooling water for an internal combustion engine, but can be applied to cooling water for cooling a heat source such as a lithium battery. Therefore, the cooling water is a heat medium, and the internal combustion engine and the lithium battery can be rephrased as a heat source.

  The first feature of the present invention is that the vortex generated downstream of the opening edge of the opening formed in the valve body is formed at the tip of the inner peripheral surface side of the seal member that contacts the outer peripheral surface of the valve body. A direction changing portion is formed in which the direction changing portion is formed so as to flow toward the flowing fluid.

  The second feature of the present invention is that the flow of the fluid that collides with the vicinity of the opening edge of the opening formed in the valve body at the distal end portion on the inner circumferential surface side of the seal member that contacts the outer circumferential surface of the valve body is opened. The direction change part which changes direction so that it may flow toward is formed.

  According to the first aspect of the present invention, the vortex generated downstream of the opening edge of the opening formed in the valve body by the direction changing portion is changed in direction so as to flow toward the fluid flowing through the opening of the valve body. Objects are positively conveyed and discharged by the fluid flowing out of the opening. For this reason, it can suppress that a suspended | floating matter is pinched | interposed between the outer peripheral surface of a valve main body, and the front end surface of a sealing member, and can come to maintain favorable sealing performance.

  Further, according to the second feature of the present invention, the direction of the fluid stream line is bent to the opening side formed in the valve main body by the direction changing portion, whereby the suspended matter also flows to the opening side. For this reason, there is less possibility that the suspended matter bites between the outer peripheral surface of the valve body and the front end surface of the seal member, and good sealing performance can be maintained.

It is a block diagram of the cooling system of the internal combustion combustion as an example to which the flow path switching valve of the present invention is applied. 1 is an overall perspective view of a flow path switching valve to which the present invention is applied. It is a disassembled perspective view of the flow-path switching valve shown in FIG. It is the elements on larger scale of the contact area of the valve main body and seal member which become the 1st Embodiment of this invention. It is the elements on larger scale of the contact area | region of the valve main body and seal member which become a modification of 1st Embodiment. It is the elements on larger scale of the contact area of the valve main body and seal member which become the 2nd Embodiment of this invention. It is the elements on larger scale of the contact area of the valve main body and seal member which become the 1st modification of 2nd Embodiment. It is the elements on larger scale of the contact area of the valve main body and seal member which become the 2nd modification of 2nd Embodiment. It is the elements on larger scale of the contact area of the valve main body and seal member which become the 3rd Embodiment of this invention. FIG. 3 is a cross-sectional view in which the vicinity of a communication path of the flow path switching valve shown in FIG. It is the elements on larger scale of the contact area of the valve main body of the conventional flow-path switching valve, and a sealing member.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments, and various modifications and application examples are included in the technical concept of the present invention. Is also included in the range.

  Before describing the embodiment of the present invention, the configuration of the flow path switching valve to which the present invention is applied will be briefly described. As described above, in the following description, the cooling water of the internal combustion engine is used as the heat medium. Is shown as an example. However, the present invention is not limited to cooling water for an internal combustion engine, and can be applied to a heat medium that cools a heat source such as a lithium battery.

  In FIG. 1, cooling water is supplied from a cooling water pump 02 to a cylinder jacket of the internal combustion engine 01, and the cooling water that has cooled the cylinder jacket is sent to a flow path switching valve 10, and a part of the cooling water is always supplied via a thermostat. It is returned again to the suction side of the cooling water pump 02 for circulation. Further, the remaining cooling water is sent to the heating auxiliary equipment such as the heating device 03, the radiator 04, and the oil cooler 05. These heat auxiliaries are shown as examples, and other heat auxiliaries may be used.

  The distribution of the cooling water to these heat auxiliaries is controlled by the electronic channel switching means 06. For example, water temperature information from a water temperature sensor 07 provided on the flow path switching valve 10, operation state information of the internal combustion engine 01, and operation state information of various operating devices in the passenger compartment are input to the electronic flow path switching unit 06. Thus, the flow path to each heat auxiliary machine is switched in accordance with the control signal calculated by the electronic flow path switching means 06.

  As will be described later, an electric motor is built in the flow path switching valve 10, and the rotation of the electric motor is controlled by a control signal from the electronic flow path switching means 06. A valve body is fixed to the electric motor, and by rotating the valve body, cooling water is caused to flow through the communication passages connected to the respective heat auxiliary machines formed in the flow path switching valve 10, thereby cooling water from the internal combustion engine. Is distributed to each heat auxiliary machine.

  FIG. 2 shows the appearance of the flow path switching valve 10. The housing main body 11 includes a connection pipe 16 </ b> A connected to the cylinder jacket, a connection pipe 16 </ b> B connected to the heating device 03, a connection pipe 16 </ b> C connected to the radiator 04, and an oil cooler 05. A connecting pipe 16D to be connected is provided. In addition, cooling water indicated by an arrow CA flows from the internal combustion engine 01 into the flow path switching valve 10, and the cooling water is distributed to the connection pipes 16 </ b> A to 16 </ b> D by the valve body provided inside the housing body 11. Yes.

  The flow path switching valve 10 is provided with a thermostat 18 filled with wax, and the cooling water flowing through the connection pipe 16A is controlled by temperature. An electronic channel switching means 06 is fixed to the top of the housing body 11 of the channel switching valve 10 to control the electric motor housed inside the housing body 11.

  FIG. 3 shows a configuration in which the flow path switching valve 10 shown in FIG. 2 is disassembled and viewed from an oblique direction. The housing body 11 is formed with a valve housing part (see FIG. 10) for housing the hollow cylindrical valve body 12 and a motor housing part 20 for housing the electric motor 19. In addition, an electronic flow path switching unit 06 is fixed to the housing body 11 from the outside by a fixing bolt, and is configured as a so-called electromechanical integrated type.

  Further, around the housing body 11, a connection pipe 16A connected to the cylinder jacket, a connection pipe 16B connected to the heating device 03, a connection pipe 16C connected to the radiator 04, and a connection pipe 16D connected to the oil cooler 05 are attached. A cover portion 21 that covers the thermostat 18 is integrally formed with the connection pipe 16C. Here, a seal member 15 and a compression spring 17 are disposed between the housing body 11 and the connection pipes 16B to 16D. The seal member 15 is formed in a circular cylindrical shape having both ends opened, and the distal end surface 15C (see FIG. 4) is pressed and brought into contact with the outer peripheral surface 12AS of the valve body 12 by the compression spring 17.

  The valve body 12 is formed in a bottomed cylindrical shape, and an opening 14 connected to each of the connection pipes 16A to 16D described above is formed on the outer peripheral surface 12S. Accordingly, the cooling water CA fed from the cooling water pump 02 and flowing from the internal combustion engine flows out to the connection pipes 16A to 16B through the opening 14.

  The valve main body 12 is fixed to the rotary shaft 22 and is rotated in the valve housing portion of the housing main body 11 in synchronization with the rotation of the rotary shaft 22. The valve main body 12 is connected to each connection in synchronization with the rotation. The connection relationship with the pipes 16A to 16D is selected (flow path switching). In addition, since the opening 14 can control the degree of overlap with the seal member 15 depending on the rotation state of the valve body 12, it may be operated to control the flow rate.

  The electric motor 19 and the valve body 12 are connected by a worm gear mechanism. That is, a worm wheel 23 is fixed to the opposite end of the rotary shaft 22 to which the valve body 12 is fixed, and this worm wheel 23 is meshed with a worm wheel 24 formed on one side of the worm shaft. Yes. A worm 25 formed on the other side of the worm shaft is engaged with a worm 26 fixed to the electric motor 19. Therefore, when the electric motor 19 rotates, this rotation is transmitted to the rotary shaft 23 via the worm 26 ⇒ worm wheel 25 ⇒ worm 24 ⇒ worm wheel 23, and finally rotates the valve body 12.

  Further, the electronic flow path switching means 06 is fixed to the housing body 11 so as to cover the electric motor 19 and the worm gear mechanism. A control signal from the electronic flow path switching unit 06 is supplied to the electric motor 19 and operated so as to perform a predetermined rotation operation.

  Since the configuration and operation of the flow path switching valve 10 having such a configuration are basically well known, further description will be omitted. In the flow path switching valve 10 having such a configuration, as described above, when the valve body 12 rotates, floating substances mixed in the cooling water are mixed with the outer peripheral surface 12S of the valve body 12 and the tip of the seal member 15. There is a risk that the contact surface of the valve main body or the seal member may be damaged by the suspended matter between the surfaces.

  The reason for this is as shown in FIG. That is, in a state where the opening 14 communicates with the communication passage 13 and the opening edge 12E of the opening 14 of the outer peripheral surface 12S of the valve body 12 is positioned in the internal passage 15P formed inside the seal member 15, the cooling water Flows out from the opening 14 to the communication passage 13, and a vortex Vr is generated in a space region formed near the tip of the inner peripheral surface 15 </ b> S of the seal member 15 downstream of the opening edge 12 </ b> E of the opening 14 formed in the valve body 12. . Moreover, the vortex Vr tends to stay in the space region downstream of the opening edge 12E, and the suspended matter Dst mixed in the cooling water also remains in the space region downstream of the opening edge 12E according to the movement of the vortex Vr. This is because when the valve body 12 rotates, the suspended matter Dst is caught in the gap between the outer peripheral surface 12S of the valve body 12 and the distal end surface 15C of the seal member 15.

  In order to solve such a problem, in the first embodiment of the present invention, the downstream end of the opening edge of the opening formed in the valve body at the distal end portion on the inner circumferential surface side of the seal member that contacts the outer circumferential surface of the valve body. The direction change part which changes the direction so that the vortex generated in the flow direction toward the cooling water flowing out from the opening of the valve body is formed.

  According to this, since the vortex generated downstream of the opening edge of the opening formed in the valve body is diverted so as to flow toward the cooling water flowing through the opening of the valve body, the floating substance positively affects the cooling water flowing out from the opening. Are transported and discharged. For this reason, it can suppress that a suspended | floating matter is pinched | interposed between the outer peripheral surface of a valve main body, and the front end surface of a sealing member, and can come to maintain favorable sealing performance.

  Here, before explaining the specific configuration of the first embodiment of the present invention, a supplementary explanation will be given for FIG.

  In FIG. 10, the housing main body 11 is integrally formed with a valve storage portion 27 for storing the valve main body 12 and a motor storage portion 20 for storing the electric motor 19. The valve main body 12 is accommodated in the valve accommodating portion 27 so as to be rotatable, and is rotated by the rotary shaft 22 described above. A communication path 13 is formed in the housing body 11 in a direction perpendicular to the tangent to the outer peripheral surface 12S of the valve body 12, and a connection pipe 16D connected to the oil cooler 05 so as to be fitted into the communication path 13 is provided. It is attached. Further, a thermostat 18 is attached to substantially the opposite side, and subsequently connected to the connection pipe 16A.

  Between the communication path 13 and the outer peripheral surface 12S of the valve body 12, a cylindrical seal member 15 having both ends opened is disposed. The seal member 15 is provided on the end surface of the connection pipe 16D fitted into the housing body 11. The compression spring 17 arranged is pressed and brought into contact with the outer peripheral surface 12S of the valve body 12. The seal member 15 is made of a synthetic resin that is smoothly slid and has excellent shape stability. In the present embodiment, a fluororesin (polytetrafluoroethylene: PTFE) is used.

  The opening 14 formed in the valve body 12 overlaps with the internal passage 15P formed in the seal member 15 while sliding with the seal member 15 as the valve body 12 rotates, Are connected. Then, the cooling water from the internal combustion engine flows into the valve body 12 from a direction perpendicular to the paper surface, and through the opening 14 formed in the valve body 12, the internal passage 15P of the seal member 15, the communication passage 13, and the connection. It flows out into the pipe 16D.

  Next, a specific configuration of the first exemplary embodiment of the present invention will be described in detail with reference to FIG. FIG. 4 is an enlarged view of the contact area between the valve body and the seal member.

  A feature of the present embodiment is that a vortex generated downstream of the opening edge 12E of the opening 14 formed in the valve body 12 at the distal end portion on the inner circumferential surface 15S side of the seal member 15 that contacts the outer circumferential surface 12S of the valve body 12. The direction change part 15G which changes a direction so that a flow may flow toward the cooling water which flows out the opening 14 of the valve main body 12 is formed.

  As shown in FIG. 4, an annular direction changing portion 15 </ b> G that is inclined inward along the circumferential shape of the inner peripheral surface 15 </ b> S is formed on the inner peripheral surface 15 </ b> S side of the distal end surface 15 </ b> C of the seal member 15. Yes. The direction changing portion 15G is inclined so that the inner diameter continuously decreases from the inner peripheral surface 15S linearly extending in the axial direction of the seal member 15 toward the outer peripheral surface 12S of the valve body 12. Further, the inclined surface of the direction changing portion 15G is formed such that the axial cross section is linear. Note that the opposite side of the inclined surface of the direction changing portion 15G is formed in the same plane as the tip surface 15C of the seal member 15 (so-called flush).

  The opening 14 and the communication passage 13 communicate with each other, and the opening edge 12E of the opening 14 formed on the outer peripheral surface 12S of the valve body 12 is located in the region of the internal passage 15P formed inside the seal member 15. Thus, when the cooling water flows out from the opening 14 to the communication path 13, the cooling water flows out as indicated by the streamline S.

  At this time, a vortex Vr is generated in a space region formed near the tip of the inner peripheral surface 15S of the seal member 15 downstream of the opening edge 12E of the valve body 12. This vortex Vr moves toward the outer peripheral surface 12S forming the opening 14 of the valve body 12, but in the case of the conventional seal member 15 shown in FIG. 11, the vortex Vr stays on the outer peripheral surface 12S side. It becomes like this.

  On the other hand, since the direction change part 15G is formed in this embodiment, the vortex Vr which has moved to the outer peripheral surface 12S side is directed toward the inner side of the internal passage 15P of the seal member 15 by the direction change part 15G. It is redirected to flow and guided to join the cooling water flowing out of the opening 14. Accordingly, the suspended matter Dst such as metal powder contained in the vortex Vr is also guided to join the cooling water flowing through the opening 14 according to the movement of the vortex Vr.

  As a result, the suspended matter Dst mixed in the cooling water is suppressed from remaining in the space region downstream of the opening edge 12E. Accordingly, since the ratio of floating substances existing in the space region downstream of the opening edge 12E decreases, even if the valve body 12 rotates in the direction of arrow R, the outer peripheral surface 12S of the valve body 12 and the distal end surface 15C of the seal member 15 The phenomenon that the suspended matter Dst is caught between the two is reduced. For this reason, damage to the outer peripheral surface 12S of the valve body 12 and the distal end surface 15C of the seal member 15 is suppressed, so that the sealing performance can be maintained over a long period of time.

  Here, the length Ls in the axial direction and the length Ds in the radial direction of the direction changing portion 15G are only required to be set to appropriate values. In short, the vortex Vr generated downstream of the opening edge 12E is generated from the opening 14. What is necessary is just to have the function to convey and discharge | emit toward the flow of the cooling water which flows out. Moreover, since the direction change part 15G formed in the seal member 15 is formed integrally with the seal member 15, the manufacture becomes easy and the increase in the manufacturing cost can be suppressed to a low level.

  As described above, according to the present embodiment, a vortex generated downstream of the opening edge of the opening formed in the valve body is formed at the distal end portion on the inner circumferential surface side of the seal member that contacts the outer circumferential surface of the valve body. The direction change part which changes direction so that it may flow toward the cooling water which flows out from the opening of was formed. According to this, since the vortex generated downstream of the opening edge of the opening formed in the valve body is diverted so as to flow toward the cooling water flowing through the opening of the valve body, the floating substance positively affects the cooling water flowing out from the opening. Therefore, the suspended matter can be prevented from being caught between the outer peripheral surface of the valve main body and the front end surface of the seal member, and good sealing performance can be maintained.

  Next, a modification of the first embodiment will be described with reference to FIG. In the first embodiment, the cross section of the direction changing portion 15G is an inclined surface extending linearly inwardly from the inner peripheral surface 15S to the outer peripheral surface 12S of the seal member 15, but in this modification example, This is different in that it is an inclined surface extending in an arc in the inner oblique direction toward the outer peripheral surface 12S. Since other configurations are the same, description thereof is omitted.

  In FIG. 5, an annular direction changing portion 15 </ b> H that is inclined inward along the circumferential shape of the inner peripheral surface 15 </ b> S is formed on the inner peripheral surface 15 </ b> S side of the distal end surface 15 </ b> C of the seal member 15. The direction changing portion 15H is inclined so that the inner diameter continuously decreases from the inner peripheral surface 15S linearly extending in the axial direction of the seal member 15 toward the outer peripheral surface 12S of the valve body 12. Further, the inclined surface of the direction changing portion 15H has an axial cross section formed in an arc shape. Note that the opposite side of the inclined surface of the direction changing portion 15H is formed in the same plane (so-called flush) as the distal end surface 15C of the seal member 15 as in the first embodiment.

  Since the direction change part 15H is formed also in this modification, the direction change is such that the vortex Vr that has moved to the outer peripheral surface 12S flows toward the inner side of the internal passage 15P of the seal member 15 by the direction change part 15H. And is guided so as to join the cooling water flowing through the opening 14. Accordingly, the floating substance Dst such as metal powder contained in the vortex Vr is also guided so as to join the cooling water flowing through the opening 14 according to the movement of the vortex Vr.

  As a result, the suspended matter Dst mixed in the cooling water is prevented from remaining in the space region downstream of the opening edge 12E. Accordingly, since the ratio of floating substances existing in the space region downstream of the opening edge 12E decreases, even if the valve body 12 rotates in the direction of arrow R, the outer peripheral surface 12S of the valve body 12 and the distal end surface 15C of the seal member 15 The phenomenon that the suspended matter Dst is caught between the two is reduced. For this reason, damage to the outer peripheral surface 12S of the valve body 12 and the distal end surface 15C of the seal member 15 is suppressed, so that the sealing performance can be maintained over a long period of time.

  Furthermore, since the shape of the direction changing portion 5H is formed in an arc shape in this modification, the vortex Vr can be smoothly guided and guided to the inside of the internal passage 15P of the seal member 15 as compared with the first embodiment. Is possible. Moreover, since the direction change part 15H is integrally formed with the sealing member 15 similarly to 1st Embodiment, while being easy to manufacture, the raise of manufacturing cost can also be suppressed low.

  Next, a second embodiment of the present invention will be described with reference to FIG. In the first embodiment, the direction changing portion is formed integrally with the seal member. However, the present embodiment is different in that the direction changing portion is formed separately and integrated with the seal member. Since other configurations are the same, description thereof is omitted.

  In FIG. 6, a direction changing member 28 made separately from the seal member 15 is integrally fixed to the inner peripheral surface 15 </ b> S side of the seal member 15. Here, the seal member 15 is made of polytetrafluoroethylene (PTFE) having good shape stability, and the direction changing member 28 is a soft synthetic resin, such as soft silicon, which has excellent heat resistance and is soft and deformable. Made of resin. The direction changing member 28 is integrated with the seal member 15 by its own elasticity or adhesive.

  The direction changing member 28 is in contact with the flat surface portion 28F that contacts the compression spring 17, the inner peripheral surface portion 28S that contacts the inner peripheral surface 15S of the seal member 15, and the outer peripheral surface 12S of the valve body 12, and is generated downstream of the opening edge 12E. The direction change part 28G which changes direction so that the vortex to flow may flow toward the inner side of the internal passage 15P of the seal member 15 is formed. The tip of the direction changing portion 28G is determined to have a length that extends beyond the tip surface 15C of the seal member 15, and the portion beyond the tip surface 15C is deformed to come into contact with the outer peripheral surface 12S. ing.

  As described above, since the direction changing member 28 made of soft silicone resin is soft and easily deformed, the direction changing portion 28G is directed inward from the linear inner peripheral surface portion 28S and further toward the outer peripheral surface 12S of the valve body 12. Thus, an arcuate inclined surface whose inner diameter is continuously reduced can be obtained. Since the direction changing portion 28G also has the same function and effect as the second embodiment with respect to the function of discharging the vortex Vr, the description thereof is omitted.

  In the present embodiment, since the direction changing member 28 is simply attached to the existing seal member 15, the manufacturing becomes easy, and the direction changing portion 28G is soft, so that it is easy to be in close contact with the outer peripheral surface 12S of the valve body 12, and the sealing performance. It becomes possible to improve.

  Next, a first modification of the third embodiment will be described with reference to FIG. In FIG. 7, the feature is that the direction changing member 28 is obtained by removing the plane portion 28F of the direction changing member 28. Since the direction changing member 28 shown in FIG. 6 has a flat portion 28F having a soft property, it is difficult to appropriately manage the compression force of the compression spring 17, and thereby the contact pressure of the seal member 15 can be managed to be constant. There is a problem that cannot be done.

  On the other hand, in the first modification shown in FIG. 7, since the flat portion 28F is removed, the compression spring 17 presses the end face of the seal member 15 made of polytetrafluoroethylene having good shape stability. . For this reason, the compression force of the compression spring 17 can be managed to be substantially constant, and as a result, the contact pressure at which the seal member 15 contacts the outer peripheral surface 12S of the valve body 12 can be managed to be substantially constant. .

  Next, a second modification of the third embodiment will be described with reference to FIG. In the first modification shown in FIG. 7, the direction changing member 28 is integrated with the seal member 15 by its own elasticity or adhesive, but in the second modification shown in FIG. Is integrally formed with the seal member 15 by insert molding, and the seal member 15 and the direction changing member 28 are firmly integrated.

  As a result, the risk of the direction changing member 28 falling off from the seal member 15 is reduced. If the direction changing member 28 drops off and floats and flows in the cooling water, it may cause a failure of the cooling water pump. However, the direction changing member 28 is integrally formed by insert molding with the seal member 15. Can be prevented.

  The direction changing portion 28G extends beyond the distal end surface 15C of the seal member 15, but may have a shape that is flush with the distal end surface 15C as in the first and second embodiments. . In this case, since there is no direction changing portion 28G to be deformed, the direction changing portions 15G and 15H in the first and second embodiments are formed in the direction changing member 28 in advance.

  In the above-described embodiment (including the modified example), the seal member and the direction changing member formed separately from this are combined. However, the seal member combined with the direction changing member is the first and the above-described seal members. This can be regarded as equivalent to the seal member shown in the second embodiment. That is, the direction changing portion is formed at the tip on the inner peripheral surface side of the seal member that contacts the outer peripheral surface of the valve body, and the vortex generated downstream of the opening edge of the opening formed in the valve body is This is because the direction can be changed to flow toward the fluid flowing out of the opening.

  Next, a third embodiment of the present invention will be described with reference to FIG. In the first embodiment, the direction changing portion 15G is formed from the middle of the inner circumferential surface 15S extending linearly in the axial direction of the seal member 15, but in this embodiment, the inner circumferential surface of the seal member 29 in the axial direction. The difference is that the entire 29S is inclined in a tapered shape. Since other configurations are the same, description thereof is omitted.

  In FIG. 9, the tapered inner peripheral surface 29 </ b> S that forms the internal passage 15 </ b> P of the seal member 29 is formed in a tapered shape whose inner diameter decreases as the outer peripheral surface 12 </ b> S of the valve body 12 is approached. Accordingly, since the tapered inner peripheral surface 29S is formed, the vortex Vr that has moved to the outer peripheral surface 12S side flows toward the inner side of the internal passage 15P of the seal member 15 by the tapered inner peripheral surface 29S. The direction is changed and guided to join the cooling water flowing through the opening 14. For this reason, the floating substance Dst such as metal powder contained in the vortex Vr is also guided so as to join the cooling water flowing through the opening 14 according to the movement of the vortex Vr.

  As a result, the suspended matter Dst mixed in the cooling water is prevented from remaining in the space region downstream of the opening edge 12E. Accordingly, since the ratio of floating substances existing in the space region downstream of the opening edge 12E decreases, even if the valve body 12 rotates in the direction of arrow R, the outer peripheral surface 12S of the valve body 12 and the distal end surface 15C of the seal member 15 The phenomenon that the suspended matter Dst is caught between the two is reduced. For this reason, damage to the outer peripheral surface 12S of the valve body 12 and the distal end surface 15C of the seal member 15 is suppressed, so that the sealing performance can be maintained over a long period of time.

  Also in the present embodiment, as in the first embodiment, the tapered inner peripheral surface 29S formed on the seal member 15 is formed integrally with the seal member 15, so that the manufacturing is facilitated and the manufacturing cost is increased. The rise of can be suppressed low.

  In the above description, the case where the discharge side of the cooling water pump 02 is connected to the valve storage chamber 27 and the cooling water flows out from the valve storage portion 27 to the communication passage 13 of the housing body 11 is described. There is also a form in which the suction side of the pump 02 is connected to the valve storage chamber 27 and the cooling water flows into the valve storage portion 27 from the communication passage 13 of the housing body 11.

  In this case, the streamline S shown in FIG. 11 is in the reverse direction, and the floating substance mixed in the cooling water directly collides with the vicinity of the contact surface between the seal member 15 and the outer peripheral surface 12S of the valve body 12, and the collision separation occurs. Due to the action, the suspended matter Dst remains in the region near the opening edge 12E of the opening 14 of the seal member 15 and the valve body 12. Then, when the valve body 14 rotates in the direction of the arrow, there is a high possibility that the valve body 14 will be caught in the gap between the outer peripheral surface 12S of the valve body 12 and the distal end surface 15C of the seal member 15.

  On the other hand, the direction of the flow line of the cooling water is bent toward the opening 14 by the direction changing portion 15G shown in FIG. 4, whereby the suspended matter also flows toward the opening 14. For this reason, there is less possibility that the suspended matter is caught in the contact surface between the seal member 15 and the outer peripheral surface 12S of the valve member 12. In this case, it does not function as the direction change part 15G which changes the direction of the flow of the vortex, but functions as the direction change part 15G which changes the direction of the flow line of the cooling water.

  In each of the above-described embodiments, the flow path switching valve that distributes the cooling water of the internal combustion engine to the heat auxiliaries has been described, but the present invention is not limited to this, and a general flow path that distributes the fluid It can also be applied to a switching valve.

  As described above, according to the present invention, the vortex generated downstream of the opening edge of the opening formed in the valve body is formed at the distal end portion on the inner circumferential surface side of the seal member that contacts the outer circumferential surface of the valve body. The direction changing part is formed to change the direction so as to flow toward the fluid flowing out of the opening.

  According to this, the vortex generated downstream of the opening edge of the opening formed in the valve body is redirected so as to flow toward the fluid flowing through the opening of the valve body. Since it is conveyed and discharged, it is possible to suppress the floating material from being sandwiched between the outer peripheral surface of the valve main body and the front end surface of the seal member, and good sealing performance can be maintained.

  Further, according to the present invention, the flow of the fluid that collides with the vicinity of the opening edge of the opening formed in the valve body at the distal end portion on the inner peripheral surface side of the seal member that is in contact with the outer peripheral surface of the valve main body It was set as the structure which the direction change part which changes direction so that it may flow toward may form.

  According to this, the direction of the fluid stream line is bent to the opening side formed in the valve body by the direction changing portion, and thereby the suspended matter also flows to the opening side. For this reason, there is less possibility that the suspended matter bites between the outer peripheral surface of the valve body and the front end surface of the seal member, and good sealing performance can be maintained.

  In addition, this invention is not limited to above-described embodiment, Various modifications are included. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described. Further, a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment. In addition, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  DESCRIPTION OF SYMBOLS 10 ... Flow path switching valve, 11 ... Housing main body, 12 ... Valve main body, 12S ... Outer peripheral surface, 12E ... Opening edge, 13 ... Communication path, 14 ... Opening, 15 ... Seal member, 15C ... End face, 15P ... Internal passage , 15S ... inner peripheral surface, 15G ... direction changing part, 16A, 16B, 16C, 16D ... connection pipe, 17 ... compression spring, 18 ... thermostat, 19 ... electric motor, 20 ... motor housing part, 21 ... cover part, 22 DESCRIPTION OF SYMBOLS ... Rotary shaft, 23 ... Worm hole, 24 ... Worm, 25 ... Worm, 26 ... Worm wheel, 27 ... Valve storage part, 28 ... Direction change member, 29 ... Seal member, 29S ... Tapered inner peripheral surface.

Claims (10)

A valve body formed in a cylindrical shape in the direction in which the axis extends, and an opening through which fluid flows out on the outer peripheral surface thereof;
A housing body having a valve housing portion in which the valve body is rotatably housed about the axis of the valve body, and a communication path that is opened in the valve housing portion and connected to external auxiliary equipment;
An internal passage that is provided in the communication passage and has openings at both ends that come into contact with the outer peripheral surface of the valve body is formed. When the opening of the valve body and the opening of the internal passage overlap, the valve body A seal member that causes the inflowing fluid to flow out to the communication path via the internal path,
Furthermore, a vortex generated downstream of the opening edge of the opening formed in the valve body is formed at the tip of the inner circumferential surface of the internal passage on the side of the seal member that contacts the outer circumferential surface of the valve body. A flow path switching valve characterized in that a direction changing portion is formed to change the direction so as to flow toward the fluid flowing out from the opening of the main body. A valve body formed in a cylindrical shape in the direction in which the axis extends, and an opening into which fluid flows into the outer peripheral surface thereof;
A housing body having a valve housing portion in which the valve body is rotatably housed about the axis of the valve body, and a communication path that is opened in the valve housing portion and connected to external auxiliary equipment;
An internal passage that is provided in the communication passage and has openings at both ends that contact the outer peripheral surface of the valve body is formed, and when the opening of the valve body and the opening of the internal passage overlap, A seal member that causes an inflowing fluid to flow into the valve body from the opening of the valve body through the internal passage;
Furthermore, fluid that flows toward the vicinity of the opening edge of the opening formed in the valve body at the distal end portion of the inner circumferential surface of the internal passage on the side of the seal member that contacts the outer circumferential surface of the valve body. A flow path switching valve, characterized in that a direction changing portion for changing the direction so as to flow toward the opening of the main body is formed. In the flow path switching valve according to claim 1 or claim 2,
The direction changing portion of the seal member is an annular direction changing portion that is inclined toward the inside of the internal passage along the circumferential shape of the inner peripheral surface of the internal passage, and the annular direction changing portion Are inclined so that the inner diameter continuously decreases toward the outer peripheral surface of the valve body. In the flow path switching valve according to claim 3,
The annular direction changing portion of the seal member has an inner diameter that continuously decreases from the middle of the inner peripheral surface extending linearly in the axial direction of the seal member and further toward the outer peripheral surface of the valve body. A flow path switching valve characterized in that the axial cross section is formed in a straight line. In the flow path switching valve according to claim 3,
The direction changing portion of the seal member has an inner diameter continuously reduced from the middle to the inner side from the inner peripheral surface extending linearly in the axial direction of the seal member and further toward the outer peripheral surface of the valve body. A flow path switching valve characterized in that the axial cross section is formed in an arc shape. In the flow path switching valve according to claim 3,
The annular direction changing portion of the seal member is formed between the openings of both of the internal passages, and the inner peripheral surface continuously tapers toward the outer peripheral surface of the valve body. A flow path switching valve having a shape. In the flow path switching valve according to claim 1 or claim 2,
The flow path switching valve, wherein the direction changing portion of the seal member is formed by integrating a soft direction changing member made separately from the seal member into the seal member. The flow path switching valve according to claim 7,
The direction change member is integrated with the seal member via the elasticity of the direction change member itself or an adhesive, or the direction change member is integrated with the seal member by insert molding. A flow path switching valve. A fluid pump that pressurizes and pressurizes a fluid serving as a heat medium for cooling the heat source, a flow path switching valve that sends the fluid from the fluid pump to a plurality of accessories, or a fluid from the plurality of accessories. An automotive heat medium system comprising a flow path switching valve for sending to the fluid pump,
An automobile heat medium system, wherein the flow path switching valve according to any one of claims 1 to 7 is used as the flow path switching valve. The automobile heat medium system according to claim 9,
The heat source is an internal combustion engine, and the accessories are at least a radiator, a heating device, and an oil cooler,
The automotive flow medium system, wherein the flow path switching valve selectively distributes cooling water of the internal combustion engine to the radiator, a heating device, and an oil cooler.

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