JP2019090385A - Fluid control valve device - Google Patents

Abstract

To provide a fluid control valve device which can inhibit deposition of foreign objects on a passage wall.SOLUTION: A fluid control valve device includes: an annular valve seat 3a formed with an air passage port 55 in which a fluid flows down; a valve element 5 which can open or close the air passage port 55; and a passage wall 3b which extends from a periphery of the valve seat 3a to the downstream side so as to form a communication passage 56 communicating with the air passage port 55 therein. The valve element 5 has an outer edge part 5c which contacts with the passage wall 3b in a state where exhaust pressure, which is generated by an exhaust gas of the engine flowing back, acts on the valve element 5.SELECTED DRAWING: Figure 4

Description

  The disclosure in this specification relates to a fluid control valve device that controls the flow of fluid flowing in a fluid passage.

  Patent Document 1 discloses a fluid control valve. The fluid control valve is a secondary that promotes secondary air generated in the secondary air flow path pipe to a three-way catalytic converter as an exhaust gas purification device at the start of the gasoline engine to promote warm-up of the three-way catalyst. It is provided in the air supply system. The fluid control valve includes an electromagnetic valve for opening and closing a secondary air passage formed inside the housing, and a reverse valve for preventing a problem such as backflow of fluid such as exhaust gas into the system on the electromagnetic valve side and the electric air pump side. It is an electromagnetic type fluid control valve integrated with a stop valve.

JP, 2008-75827, A

  In an apparatus like Patent Document 1, when exhaust gas pressure caused by backflow of exhaust gas from the engine acts on the solenoid valve, substances contained in the exhaust gas may adhere to the passage wall forming a passage near the valve seat. Foreign matter accumulated on the valve seat including the passage wall may interfere with the valve opening operation and the valve closing operation of the valve body, which may cause a problem that the solenoid valve can not perform its original function.

  An object of the disclosure in this specification is to provide a fluid control valve device capable of suppressing the accumulation of foreign matter on a passage wall.

  Several aspects disclosed in this specification employ different technical means from one another in order to achieve each purpose. Further, the claims and the reference numerals in the parentheses described in this section are an example showing the correspondence with the specific means described in the embodiment described later as one aspect, and the technical scope is limited. is not.

  One of the disclosed fluid control valve devices includes a housing (2) having an annular valve seat (3a) in which a fluid passage (55) through which the fluid flows down is formed, and a valve closed in contact with the valve seat The valve seat (5; 205; 305) which can open and close the fluid passage by opening away from the valve seat, and the passage (56) communicating with the fluid passage are formed inside. A passage wall (3b) extending from the periphery to the downstream side of the fluid flow, and the valve body is mounted on the passage wall in a state where exhaust pressure generated by backflow of exhaust gas of the engine (10) acts on the valve body. It has an outer edge (5c; 205c; 305c) in contact with it.

  In a state where exhaust pressure by backflow of exhaust gas from the engine acts on the valve body, foreign substances contained in the exhaust gas may adhere to the passage wall or the like. According to this fluid control valve device, in the process of moving the valve body in the valve opening direction, the outer edge portion is displaced so as to rub the passage wall, so foreign objects adhering to the passage wall can be scraped off by the outer edge portion. it can. Even if foreign matter is deposited on the passage wall, the deposited foreign matter is scraped off by the function of the outer edge portion, so that it is possible to provide the fluid control valve device capable of suppressing the foreign matter from depositing on the passage wall.

  One of the disclosed fluid control valve devices includes a housing (2) having an annular valve seat (3a) in which a fluid passage (55) through which the fluid flows down is formed, and a valve closed in contact with the valve seat The valve body (105) capable of opening and closing the fluid passage by opening away from the valve seat and the passage (56) communicating with the fluid passage are formed on the downstream side from the periphery of the valve seat And the valve body has a passage wall relative to the downstream passage (43) located closer to the engine (10) than the passage wall when the valve body is in a closed state. And the outer edge (105c) in contact with the inner wall (3c) of the housing so as to block the

  As described above, in the state where the exhaust pressure due to the backflow of the exhaust gas acts on the valve body, foreign substances contained in the exhaust gas may adhere to the passage wall or the like. According to this fluid control valve device, when the valve is in the closed state, the outer wall of the valve disc blocks the passage wall from the downstream passage, so that the exhaust gas flowing back through the downstream passage flows to the passage wall. Contact can be suppressed. Therefore, according to this fluid control valve device, foreign matter is less likely to adhere to the passage wall in the valve closed state, so that foreign matter can be prevented from depositing on the passage wall.

It is a schematic diagram showing composition of a secondary air supply system provided with a secondary air control valve of a 1st embodiment. It is sectional drawing which shows the structure of the secondary air control valve of 1st Embodiment. It is the fragmentary sectional view which showed the valve closing state about the poppet valve and valve seat in the secondary air control valve of 1st Embodiment. It is a fragmentary sectional view showing the state at the time of exhaust gas backflow about the poppet valve and valve seat of a 1st embodiment. It is the fragmentary sectional view which showed the valve open state about the poppet valve and valve seat of 1st Embodiment. It is the fragmentary sectional view which showed the valve closing state about the poppet valve and valve seat of 2nd Embodiment. It is the fragmentary sectional view which showed the state at the time of exhaust gas backflow about the poppet valve and valve seat of 3rd Embodiment. It is the fragmentary sectional view which showed the state at the time of exhaust gas backflow about the poppet valve and valve seat of 4th Embodiment. It is a bottom view showing a poppet valve of a 5th embodiment. It is the fragmentary sectional view showing the state between the time of full opening and the time of valve closing about the poppet valve of another embodiment, and a valve seat.

  Hereinafter, a plurality of modes for carrying out the present disclosure will be described with reference to the drawings. The same referential mark may be attached | subjected to the part corresponding to the matter demonstrated by the form preceded in each form, and the overlapping description may be abbreviate | omitted. When only a part of the configuration is described in each form, the other forms described above can be applied to other parts of the configuration. Not only combinations of parts which clearly indicate that combinations are possible in each embodiment, but also combinations of embodiments even if not explicitly specified, unless any problem occurs in the combinations. It is also possible.

First Embodiment
A fluid control valve device according to a first embodiment will be described with reference to FIGS. 1 to 5. The secondary air control valve 1 is an example of a fluid control valve device that controls the flow rate of fluid that can achieve the purpose disclosed in the specification. The secondary air control valve 1 is a fluid control valve device that controls the amount of downstream flow of secondary air generated in the secondary air flow pipes 11 and 12 at the start of an internal combustion engine such as a gasoline engine. The secondary air control valve 1 is incorporated in a secondary air supply system that guides secondary air whose flow rate is controlled to a three-way catalytic converter 13 as an exhaust gas purification device to promote warm-up of the three-way catalyst. There is. The secondary air supply system is mounted, for example, in an engine room of a car or the like. The electric air pump 14 and the secondary air control valve 1 are connected via the secondary air flow passage pipe 11 so as to ensure air tightness. The secondary air control valve 1 and the engine exhaust pipe 16 are connected via a secondary air flow pipe 12 so as to ensure air tightness.

  The three-way catalytic converter 13 collectively includes three elements of carbon monoxide, hydrocarbons, and nitrogen oxides, which are harmful components in the exhaust gas discharged from the combustion chamber of each cylinder of the engine 10, by a chemical reaction. Change to harmless ingredients. The three-way catalytic converter 13 is an exhaust gas purification device for an internal combustion engine that changes hydrocarbons into harmless water, particularly by the oxidation action.

  The engine 10 obtains an output by thermal energy obtained by burning a mixture of intake air and fuel in a combustion chamber. The engine 10 includes an engine intake pipe 15 for supplying intake air into the combustion chamber of each cylinder, and an engine for discharging the exhaust gas flowing out of the combustion chamber of each cylinder to the outside via the three-way catalytic converter 13 And an exhaust pipe 16. Engine 10 includes a cylinder block slidably supporting piston 17 in a cylinder bore, and a cylinder head in which an intake port and an exhaust port are formed.

  An intake port and an exhaust port of the engine 10 are opened and closed by an intake valve 18 and an exhaust valve 19. Further, a spark plug 20 is attached to the cylinder head of the engine 10 so that the tip end is exposed to the combustion chamber. Further, an electromagnetic fuel injection valve 21 for injecting fuel is attached to the wall surface of the intake port or the back wall surface of the intake valve 18.

  An intake passage communicating with the combustion chamber of the engine 10 via an intake port is formed in the engine intake pipe 15, and intake air drawn into the combustion chamber of the engine 10 flows through the intake passage. Inside the engine intake pipe 15, an air cleaner 22 for filtering intake air and a throttle valve 24 for opening and closing corresponding to the depression amount of the accelerator pedal 23, that is, the accelerator opening degree are accommodated.

  An exhaust passage communicating with the combustion chamber of the engine 10 via an exhaust port is formed inside the engine exhaust pipe 16, and this exhaust passage flows out of the combustion chamber of the engine 10 and is directed to the three-way catalytic converter 13. Flows. In the engine exhaust pipe 16, an air-fuel ratio sensor 25 for detecting the air-fuel ratio of the exhaust gas (oxygen concentration in the exhaust gas), a catalyst temperature sensor 26 for detecting the temperature of the three-way catalyst, and the exhaust temperature for detecting the exhaust gas temperature Sensors etc. are installed.

  The secondary air supply system is configured by a secondary air control valve 1, a secondary air flow path pipe 11, 12, an electric air pump 14, and the like. A secondary air passage communicating with the exhaust passage of the engine exhaust pipe 16 is formed in the secondary air flow passage pipe 11 and the secondary air flow passage pipe 12, and the secondary air passage is formed of secondary air. Flow. In the secondary air flow channel pipe 11 and the secondary air flow channel pipe 12, a pressure sensor 27 and the like that detect the pressure of the secondary air are installed.

  The electric air pump 14 is airtightly connected to the upstream end of the secondary air flow passage pipe 11. The electric air pump 14 includes an electric motor that receives a supply of electric power and generates a driving force, a pump impeller that is rotationally driven by the electric motor, and an air filter that prevents foreign matter from entering the pump impeller side. The electric air pump 14 has a motor housing 31 housing and holding an electric motor therein, a pump housing 32 rotatably housing a pump impeller therein, and a filter case airtightly coupled to the pump housing 32 through an air duct 33. And 34.

  The secondary air control valve 1 is connected between the secondary air flow pipe 11 and the secondary air flow pipe 12 so as to ensure airtightness. The secondary air control valve 1 is an electromagnetic fluid control valve (combination valve) in which an air switching valve (hereinafter also referred to as ASV) constituting an electromagnetic passage open / close valve (also referred to as a solenoid valve) and a check valve are integrated. Also called a module). The ASV is a device for opening and closing the secondary air passage 35 formed inside the housing 2. The check valve has a function of preventing a problem that fluid such as exhaust gas flows back into the system on the ASV side and the electric air pump side from the junction of the secondary air flow pipe 12 and the engine exhaust pipe 16.

  The check valve includes a housing 41 coupled to the downstream side of the secondary air flow than the housing 2 and a metal plate 42 held by the housing 41. The check valve further includes a thin film reed valve 44 for opening and closing a plurality of air passage openings 43 formed in the metal plate 42, and a reed stopper 45 for restricting the opening degree or the maximum opening degree of the reed valve 44. .

  The housing 41 is connected to the upstream end of the secondary air flow pipe 12 so as to ensure air tightness. In this embodiment, when the reed valve 44 is opened, the secondary air flowing from the plurality of air passage ports 43 into the fluid outlet passage 46 in the housing 41 is supplied from the outlet port 47 which is the outlet of the housing 41. It flows out into the secondary air flow pipe 12. The reed valve 44 constitutes a valve body of a check valve which is opened by the pressure of the secondary air discharged from the electric air pump 14.

  The ASV moves back and forth linearly along the central axis of the valve seat 3a by approaching and separating from the valve seat 3 provided on the housing 2 and the annular valve seat 3a integrally formed on the valve seat 3 And a poppet valve 4. ASV is an electromagnetic valve which attracts the poppet valve 4 and displaces it in the axial direction by the electromagnetic force generated by the solenoid unit. Furthermore, the ASV contacts the valve head 6a of the poppet valve 4 and the valve stem 6 with the coil spring 7 urging the valve in the valve closing direction, in other words, the seat on the valve seat 3a, and contacts the valve seat 3a when the valve is closed. And a valve body 5.

  The secondary air supply system electronically controls an actuator, which is a power source of the secondary air control valve 1, and an electric motor, which is a power source of the electric air pump 14, based on the operating condition of the engine 10 (hereinafter referred to as ECU Of the The ECU includes functions such as a CPU that performs control processing and arithmetic processing, various programs, a memory such as a ROM or a RAM that stores data, an input circuit, an output circuit, an electromagnetic valve drive circuit, and a pump drive circuit. It has the microcomputer of the structure comprised.

  When the ignition switch is turned on, the ECU adjusts the drive power supplied to the actuator of the secondary air control valve 1 based on the control program stored in the memory to Control opening and closing operation. The ECU adjusts the supplied electric power supplied to the electric motor of the electric air pump 14 to control the rotational operation of the electric air pump 14, for example, the rotational speed.

  The ECU detects the exhaust gas temperature by the exhaust temperature sensor at engine start-up, and drives the actuator of the secondary air control valve 1 so as to open the poppet valve 4 when the exhaust gas temperature is below the predetermined value. Supply power. At this time, electric power is also supplied to the electric motor of the electric air pump 14, so that a secondary air flow is generated inside the secondary air flow pipes 11, 12. The ECU also has a failure diagnosis function that diagnoses an abnormal failure of the electric air pump 14. The ECU determines that the secondary air pressure in the secondary air flow path pipes 11, 12 detected by the pressure sensor 27 is abnormal when it is out of the predetermined pressure range, and the secondary air control valve 1 is activated to the actuator. The supplied electric power and the electric motor of the electric air pump 14 are limited or cut off.

  The housing 2 of the ASV is manufactured by a metal material, for example, an aluminum die cast or the like. A cylindrical tubular wall 51 is formed in the housing 2. Inside the cylindrical wall portion 51, the poppet valve 4 is accommodated and held so as to open and close the passage. An inlet pipe 52 extending in the radial direction with respect to the axial direction of the poppet valve 4 is integrally provided on the cylindrical wall portion 51.

  In this embodiment, the secondary air flows down from the inlet port 53 which is the inlet portion of the inlet pipe 52 through the fluid introduction passage 54 in the housing 2 to the air passage port 55 formed on the inside of the valve seat 3a. Is configured as. A communication passage 56 is formed at the outlet of the housing 2 for communicating the air passage 55 of the ASV with the air passage 43 of the check valve. At the open end edge of the outlet of the housing 2, a coupling portion 57 coupled to the housing 41 is formed. In this embodiment, the air passage 55, the fluid introduction passage 54 and the communication passage 56 constitute a secondary air passage 35 formed inside the ASV.

  On the inner peripheral portion of the cylindrical wall 51, an annular partition 58 is provided to divide the inside of the housing 2 into two fluid passages, ie, a fluid introduction passage 54 and a communication passage 56. As shown in FIG. 2, at least the partition 58 is integrally provided with an annular valve seat 3a and a passage wall 3b on which the valve body 5 can be seated. The valve seat 3 is formed with a circular air passage port 55 through which the secondary air passes as a fluid passage port through which the fluid flows.

  The ASV includes an actuator that is a valve drive device that drives the poppet valve 4 in the valve opening direction. The actuator comprises a cylinder wall 51 of the housing 2, an electromagnet including a coil 8 generating a magnetic force by energization, and a moving core 67 attracted to the electromagnet. The electromagnet has a coil 8, a stator core 65 and a yoke 66. The stator core 65 and the yoke 66 are magnetized by supplying drive power to the coil 8 to become an electromagnet. The stator core 65 has a suction portion for suctioning the moving core 67.

  The moving core 67 is press-fitted and fixed to the outer periphery of the small diameter portion located at the upper portion of the valve stem 6. When driving power is supplied to the coil 8, the moving core 67 is magnetized and moves downward along the poppet valve 4 in the axial direction, which is the stroke direction. Thus, in this embodiment, the stator core 65, the yoke 66, and the moving core 67 are provided as a plurality of magnetic bodies that form a magnetic circuit with the coil 8. In addition, as a plurality of magnetic bodies forming a magnetic circuit with the coil 8, the yoke 66 may be eliminated and only the stator core 65 and the moving core 67 may be provided. The stator core 65 may be divided into two or more.

  The coil spring 7 is housed and held between the plate pressure 64 and the moving core 67. The coil spring 7 generates a spring load, which is a biasing force for moving the moving core 67 back to the default position, to the moving core 67. The coil spring 7 functions as a load applying means for generating an urging force that urges the valve head 6 a away from the seal portion 9 with respect to the poppet valve 4 and the moving core 67.

  In the coil 8, a conducting wire provided with an insulating film is wound around the resin bobbin bobbin 69 a plurality of times. The coil 8 is an exciting coil that generates a magnetic attractive force (electromotive force) when supplied with drive power, and generates a magnetic flux around when it is energized. Since the moving core 67, the stator core 65 and the yoke 66 are magnetized by the generation of the magnetic flux, the moving core 67 is attracted to the suction portion of the stator core 65 and moves in the stroke direction (downward). The coil 8 and the coil bobbin 69 are held in a cylindrical space (a coil storage portion) formed between the inner periphery of the cylindrical wall 51 or the yoke 66 and the outer periphery of the cylindrical portion of the stator core 65.

  The coil 8 has a coil portion wound between a pair of flanges of the coil bobbin 69 and a pair of end lead wires extracted from the coil portion. The outer peripheral side of the coil portion is covered and protected by a resin mold member that functions as a resin case. The pair of terminal lead wires of the coil 8 is electrically connected to the terminal 70 which is a pair of external connection terminals, for example, by caulking or welding. The tips of the pair of terminals 70 are exposed in the male connector 72 of the connector housing 71 made of resin, and are inserted into the female connector of the external power supply side or the solenoid valve drive circuit side to make an electrical connection. Act as a pin.

  The valve seat 3 includes a valve seat 3 a that the valve body 5 opens and closes, and is formed of the same material as the housing 2. The valve seat 3 includes a valve seat 3a provided at the opening peripheral portion of the air passage port 55, and a passage wall 3b extending from the periphery of the valve seat 3a to the downstream side of the secondary air flow. The downstream side described below means the downstream side of the secondary air flow. The passage wall 3 b is provided to form a communication passage 56 communicating with the air passage port 55 which is a fluid passage port. The passage wall 3b forms a cylindrical wall extending downstream from the periphery of the valve seat 3a so as to form a passage in communication with the fluid passage port.

  The valve head 6 a is a disk-like portion extending radially outward from the lower portion of the valve stem 6, and is integrally provided on the valve stem 6 with the same material as the valve stem 6. The valve head 5a is integrally provided with a valve element 5 which contacts the valve seat 3a when the poppet valve 4 is closed to seal the gap between the poppet valve 4 and the valve seat 3a. The valve body 5 is annular, and is provided so as to be able to contact the valve seat 3a and the passage wall 3b provided on the entire circumference of the opening peripheral portion of the air passage port 55. The valve body 5 is made of an elastically deformable material, for example, an elastomer such as an elastically deformable resin, a fluorine-based rubber, or a silicone rubber.

  FIG. 3 is a partial cross-sectional view showing the closed state of the poppet valve 4. As shown in FIG. 3, the valve body 5 has a disk-like annular portion 5a coupled to the outer peripheral edge of the valve head 6a, and a cylindrical portion 5b extending from the radially outer side to the downstream side of the annular portion 5a. An outer edge portion 5c projecting radially outward from the downstream side portion of the cylindrical portion 5b is integrally provided. The valve head 6a and the valve body 5 are coupled by integrally forming parts of different materials. For example, the valve head 6a and the valve body 5 can be integrally molded using insert molding of metal and resin using a mold or two-color molding of rubber and resin. The valve head 6a and the valve body 5 may be integrally joined by bonding the joint with an adhesive, or may be integrally joined using a joint component such as a screw or a caulking.

  The poppet valve 4 is integrally formed of, for example, a metal material, rubber, or other resin material, and is movably accommodated inside the housing 2. The poppet valve 4 is in contact with and spaced apart from the valve seat 3 a of the valve seat 3 to constitute a valve body that closes and opens the air passage port 55. The poppet valve 4 has a cylindrical valve shaft 6 extending from the central portion of the valve head 6 a toward the actuator or upstream, and a size located at the lower or downstream side of the valve shaft 6 and covering the air passage 55 And a valve-like or flange-like valve head 6a. The valve shaft 6 is provided to penetrate the air passage 55 in the axial direction. The outer peripheral edge portion of the valve head 6 a is coupled to the inner edge portion of the annular portion 5 a of the valve body 5 to support the valve body 5 inside the valve body 5. The valve head 6a is provided such that the back surface located upstream or above is located downstream or below the valve seat 3a, and the valve body 5 is seated on the valve seat 3a from downstream or below Provided in

  The poppet valve 4 is a space formed between the check valve and the valve seat 3a, ie, the communication passage 56, when the valve head 6a is most separated downstream from the valve seat 3a, that is, when the valve is fully opened. On the way, the valve head 6a is held. The poppet valve 4 moves to the downstream side along the axis of the poppet valve 4, that is, to the check valve side when the valve opening operation is performed. As the poppet valve 4 reciprocates along the axial direction of the valve shaft 6, the valve head 6a and the valve body 5 are axially displaced with respect to the valve seat 3a.

  Therefore, when the APV moves the poppet valve 4 to the valve opening side which is the downward direction along the axis, the valve head 6a and the valve body 5 are separated from the valve seat 3a and the air passage port 55 is opened. It is set to the fully open position. When the poppet valve 4 moves upward (valve closing direction) along the axis of the ASV, the ASV is set in a valve fully closed position where the valve body 5 is seated on the valve seat 3 a to close the air passage port 55.

  The valve body 5 is a member that can be deformed by an external force between a closed valve state in which the upstream surface of the annular portion 5a contacts the valve seat 3a and a fully open state in which the annular portion 5a is most separated from the valve seat 3a. As for valve element 5, it is preferred that annular part 5a is formed with a material which can be elastically deformed easily. Thereby, the valve body 5 can exhibit the function of closing the air passage port 55 in the closed state and blocking the inflow of the secondary air into the secondary air flow passage pipe 12.

  FIG. 4 is a partial cross-sectional view showing a state in which the exhaust gas flows backward. As shown in FIG. 4, the outer edge portion 5 c is provided so as to at least contact the passage wall 3 b in a state where the exhaust gas of the engine 10 reversely flows and the exhaust pressure acts. The exhaust pressure is also generated when the reed valve 44 is opened due to exhaust pulsation or vehicle vibration caused by the opening and closing of the exhaust valve of the engine 10. As described above, in a situation where the exhaust gas from the engine 10 easily contacts the valve body 5, foreign matter contained in the exhaust gas, for example, nitrogen oxides, sulfur oxides, fine particulate matter, etc. May adhere. For example, when the valve body 5 is closed, the extraneous matter may be caught between the valve seat 3a or the passage wall 3b and the valve body 5 and cause a valve leakage. Therefore, there is a need to remove deposits.

  The outer edge portion 5c is provided on the entire circumference of the cylindrical portion 5b. The outer edge portion 5 c is provided so as to protrude radially outward from the entire periphery of the cylindrical portion 5 b, and is a portion located on the radially outer side in the valve body 5. Therefore, the outer edge 5 c contacts the passage wall 3 b around the entire circumference of the valve body 5 in a state where the exhaust pressure acts on the valve body 5. The valve body 5 has a configuration in which the annular portion 5a supported by the valve head 6a is a fixed end and the outer edge 5c is a free end. With this configuration, the outer edge portion 5c is the portion that is most likely to be displaced by an external force acting by rubbing against the passage wall 3b in the process of axially displacing the valve body 5 between the fully open state and the closed valve state.

  Furthermore, as for the valve body 5, it is preferable that the outer edge part 5c is formed with the material which can be elastically deformed easily. According to this configuration, the outer edge portion 5c is a portion that is most likely to be displaced by an external force that acts by rubbing against the passage wall 3b. Furthermore, when the valve body 5 is displaced toward the valve opening side, the outer edge portion 5c can be elastically deformed in a state of being in contact with the passage wall 3b. For example, the end of the outer edge 5c in contact with the passage wall 3b can be elastically deformed so as to be positioned upstream of the root side of the outer edge 5c. According to this, it is possible to obtain the effect of scraping off the deposit by utilizing the restoring force that causes the outer edge portion 5 c to return to the original shape.

  The thickness dimension of the outer edge portion 5c is such that the tip end portion is smaller than the root portion. Thus, the outer edge portion 5c has a characteristic that the tip end side is easily deformed. Further, the outer edge portion 5c is formed such that the tip end surface forms a curved surface. According to this configuration, the contact area between the elastically deformed outer edge portion 5c and the passage wall 3b can be increased, so that the passage wall 3b can be continuously rubbed while maintaining a large contact area at the time of the valve opening operation. It is possible to provide the valve body 5 having a large effect of taking.

  As shown in FIG. 3, the outer edge portion 5c may be configured to be in contact with the passage wall 3b in a closed state where the annular portion 5a is in contact with the valve seat 3a. During travel of the vehicle, the valve is normally in the closed state, and in the situation where exhaust gas is generated, the valve body 5 is often in the closed state. In addition, in the closed state, the exhaust gas of the engine 10 may flow backward to cause the exhaust pressure to act on the valve body 5, or the exhaust gas may not have a reverse flow.

  In the state shown in FIG. 3 and FIG. 4, the outer edge 5 c is in contact with the passage wall 3 b at a portion upstream of the downstream end wall 3 c which is the downstream end of the passage wall 3 b. The valve body 5 is provided such that the outer edge portion 5c is located downstream of the downstream end wall 3c in the fully open state. In the passage wall 3b, foreign substances contained in the exhaust gas may adhere to the downstream side of the portion where the outer edge 5c is in contact. When the valve body 5 is opened from the state shown in FIG. 3 or FIG. 4, the outer edge 5 c is displaced downstream while being in contact with the passage wall 3 b. In this valve opening operation, as shown in FIG. 5, the outer edge portion 5c scrapes off the foreign matter adhering to the passage wall 3b on the downstream side of the outer edge portion 5c, thereby removing the foreign matter accumulated on the passage wall 3b. be able to.

  Next, the function and effect provided by the fluid control valve device of the first embodiment will be described. The fluid control valve device includes a housing 2 having an annular valve seat 3a in which a fluid passage through which fluid flows down is formed, a valve body 5 capable of opening and closing the fluid passage, and a communication passage communicating with the fluid passage. And a passage wall 3b extending downstream from the periphery of the valve seat 3a so as to form an inner side 56 thereof. The valve body 5 has an outer edge 5 c in contact with the passage wall 3 b in a state where an exhaust pressure generated by backflow of exhaust gas of the engine 10 acts on the valve body 5.

  In a state where exhaust pressure due to backflow of exhaust gas from the engine 10 is acting on the valve body 5, foreign substances contained in the exhaust gas may adhere to the passage wall 3 b of the valve seat 3 or the like. According to this configuration, the outer edge portion 5c can be displaced so as to rub the passage wall 3b in the process of moving the valve body 5 in the valve opening direction. As a result, the foreign matter adhering to the passage wall 3b can be scraped off by the outer edge portion 5c and dropped from the passage wall 3b. Even if foreign matter is accumulated on the passage wall 3b, the foreign matter accumulated can be removed by the function of the outer edge portion 5c. As described above, it is possible to provide a fluid control valve device capable of exerting the foreign matter removing function for each valve opening operation of the valve from the state where the exhaust pressure is applied. Therefore, according to the fluid control valve device of the first embodiment, deposition of foreign matter on the passage wall 3b can be suppressed.

  The valve body 5 has an outer edge 5 c that contacts the passage wall 3 b around the entire circumference of the valve body 5 in a state where the exhaust pressure acts on the valve body 5. According to this configuration, it is possible to remove the deposit around the entire circumference of the passage wall 3b, thereby providing a fluid control valve device capable of further avoiding a situation that hinders the valve opening operation or the valve closing operation of the valve body 5. it can.

  The outer edge portion 5c has a shape in which the thickness dimension on the tip end side is smaller than that on the root side, and therefore, the outer edge portion 5c is easily elastically deformed when the valve body 5 is displaced in the valve opening direction. Therefore, the outer edge portion 5c can be elastically deformed so that the tip end side in contact with the passage wall 3b is positioned on the upstream side of the root side, so using the restoring force for the outer edge portion 5c to return to the original shape. The deposit can be scraped off.

Second Embodiment
2nd Embodiment demonstrates the valve body 105 which is the other form of the valve body 5 of 1st Embodiment with reference to FIG. In FIG. 6, the same components as those of the first embodiment are denoted by the same reference numerals and the same functions and effects can be obtained. The configurations, operations, and effects not particularly described in the second embodiment are the same as those in the first embodiment. Hereinafter, only differences from the first embodiment will be described.

  FIG. 6 is a partial cross-sectional view showing the closed state of the poppet valve 4. The valve head 6a and the valve body 105 are coupled by integrally forming parts of different materials. As shown in FIG. 6, the valve body 105 includes a disk-shaped annular portion 5a coupled to the valve head 6a, a cylindrical portion 105b extending downstream from the radially outer side of the annular portion 5a, and a downstream portion of the cylindrical portion 105b. An outer edge portion 105c projecting radially outward from the side portion is integrally provided. The valve body 105 is made of an elastically deformable material, for example, an elastomer such as an elastically deformable resin, a fluorine-based rubber, or a silicone rubber.

  The cylindrical portion 105b is shaped so as to extend from the radially outer side to the downstream side of the annular portion 5a, and is integral with the outer edge portion 105c at its downstream end. The cylindrical portion 105 b is provided such that the downstream end is located downstream of and downstream of the downstream end wall 3 c in the valve closed state. The outer edge portion 105c is in contact with the downstream end wall 3c from below when the annular portion 5a is in a closed state in which the annular portion 5a contacts the valve seat 3a. The outer edge portion 105c is provided on the entire circumference of the cylindrical portion 105b. Therefore, the outer edge portion 105c blocks the passage wall 3b from the air passage port 43 located closer to the engine 10 than the passage wall 3b, and the valve body 105 as a whole is closed with the air passage port 55 and the passage wall 3b. It divides | segments so that the communication path 56 may not connect.

  If the exhaust gas flows backward in this state, foreign matter in the exhaust gas may adhere to the downstream end wall 3c where the outer edge portion 105c is not in contact, but foreign matter on the passage wall 3b blocked from the passage by the valve body 105 Does not touch. On the other hand, when the valve body 105 is displaced downstream from the valve closed state shown in FIG. 6, the annular portion 5a is separated from the valve seat 3a, and the outer edge portion 105c is separated from the downstream end wall 3c. In this state, since the secondary air in the secondary air flow passage pipe 11 flows into the secondary air flow passage pipe 12 through the air passage port 55, the possibility of the exhaust gas coming into contact with the passage wall 3b is low.

  The fluid control valve device according to the second embodiment includes a housing 2 having an annular valve seat 3a in which a fluid passage is formed, a valve body 105 capable of opening and closing the fluid passage, and a series communicating with the fluid passage. And a passage wall 3b extending downstream from the periphery of the valve seat so as to form the passage 56 inward. The valve body 105 has an outer edge portion 105c in contact with the inner wall of the housing 2 so as to shut off the passage wall 3b with respect to the downstream passage located closer to the engine 10 than the passage wall 3b when the valve is closed. doing. The valve body 105 has an outer edge portion 105c that contacts the downstream end wall 3c around the entire circumference of the valve body 105 in the valve closed state.

  As described above, in the state where the exhaust pressure due to the backflow of the exhaust gas from the engine 10 acts on the valve body 105, foreign substances contained in the exhaust gas may adhere to the passage wall 3b and the like. According to this fluid control valve device, the passage wall 3b is closed to the downstream passage by the outer edge portion 105c of the valve body 105 when the valve is in the closed state, so that the exhaust gas flowing back through the downstream passage Contact with the passage wall 3b can be suppressed. According to this fluid control valve device, the foreign matter is less likely to adhere to the passage wall 3b in the valve closed state, so that the foreign matter can be prevented from depositing on the passage wall 3b.

Third Embodiment
In the third embodiment, a valve body 205 which is another form of the valve body 5 of the first embodiment will be described with reference to FIG. In FIG. 7, the same components as those in the first embodiment are denoted by the same reference numerals and the same operations and effects can be obtained. The configurations, operations, and effects not particularly described in the third embodiment are the same as in the first embodiment, and only differences from the first embodiment will be described below.

  FIG. 7 is a partial cross-sectional view showing the closed state of the poppet valve 4 and the state where backflow of exhaust gas is generated. The valve head 6a and the valve body 205 are coupled by integrally forming parts of different materials. As shown in FIG. 7, the valve body 205 includes a disk-shaped annular portion 5a coupled to the valve head 6a, a cylindrical portion 205b extending downstream from the radially outer side of the annular portion 5a, and a downstream portion of the cylindrical portion 205b. An outer edge portion 205c projecting radially outward from the side portion is integrally provided. The valve body 205 is made of an elastically deformable material, for example, an elastically deformable resin, an elastomer such as fluorine-based rubber, or silicone rubber.

  The cylindrical portion 205b is shaped to extend from the radially outer side to the downstream side of the annular portion 5a, and is integral with the outer edge portion 205c at the downstream end. The cylindrical portion 205b is formed such that the thickness dimension thereof becomes smaller toward the downstream side and the lower side. The outer edge portion 205c is provided in such a manner that the tip end which is the downstream end portion of the outer edge portion 205c is positioned upstream and above the downstream end wall 3c in a valve closed state in which the annular portion 5a contacts the valve seat 3a. The outer edge portion 205c is in contact with the passage wall 3b when in the valve closed state. The outer edge portion 205c is shaped so as to extend downstream toward the tip when in the open state. Therefore, the outer edge portion 105c has a vertical cross-sectional shape that inclines obliquely downward with respect to the axis of the valve stem portion 6 or the valve body 205 so as to be positioned radially outward toward the downstream side.

  Further, the outer edge portion 205c has a tapered shape in which the longitudinal cross-sectional shape becomes thinner toward the tip, and the thickness dimension becomes smaller toward the tip. With this configuration, the contact area between the outer edge portion 205c and the passage wall 3b can be reduced, and the outer edge portion 205c is easily elastically deformed when the valve body 205 is displaced in the valve opening direction. The outer edge portion 205c is provided on the entire circumference of the cylindrical portion 205b.

  According to the fluid control valve device of the third embodiment, since the outer edge portion 205c has a shape in which the thickness dimension on the tip end side is smaller than that on the root side, the outer edge portion 205c is displaced when the valve body 205 is displaced in the valve opening direction. It is easy to elastically deform. Therefore, the outer edge portion 205c can be elastically deformed so that the tip end side in contact with the passage wall 3b is positioned more upstream than the root side, so that the restoring force for the outer edge portion 205c to return to the original shape The deposit can be scraped off using it.

  Further, the outer edge portion 205c is shaped so as to be positioned downstream as it goes to the tip, so that when the valve body 205 is displaced in the valve opening direction, the outer edge portion 205c contacts the passage wall 3b at an acute angle. Can be provided. Furthermore, since the valve body 205 has a shape capable of suppressing the pressure on the passage wall 3b when it is displaced in the valve closing direction from the valve opening state, the valve closing operation resistance is small and smooth valve closing operation is possible. The valve body 205 can be provided.

  Further, since the outer edge portion 205c has a tapered shape in which the longitudinal cross-sectional shape is tapered toward the tip, the contact area between the outer edge portion 5c and the passage wall 3b can be reduced, the contact pressure becomes large, and the extraneous material is scraped off A large valve body 205 can be provided. Further, since the passage wall 3b can be continuously rubbed while applying a large contact pressure to the passage wall 3b at the time of the valve opening operation, it is possible to provide the valve body 205 having a large effect of scraping off the deposit.

Fourth Embodiment
In the fourth embodiment, another form of the positional relationship between the valve body and the passage wall 3b will be described. In FIG. 8, the same components as those of the above-described embodiment are denoted by the same reference numerals and the same operations and effects can be obtained. The configurations, operations, and effects not particularly described in the fourth embodiment are the same as those in the above-described embodiment, and only differences from the first embodiment and the third embodiment will be described below.

  FIG. 8 is a partial sectional view showing the closed state of the poppet valve 4 and the state in which the backflow of exhaust gas is generated. The outer edge 205c of the valve body 205 is located at the downstream end of the passage wall 3b when the valve is closed. That is, in the valve closed state, the passage wall 3b is hardly present downstream of the outer edge portion 205c. The valve body 205 blocks the whole of the passage wall 3b from the communication passage 56 in the open state, thereby reducing the area where foreign matter can be attached to the passage wall 3b.

  According to the fluid control valve device of the fourth embodiment, the valve body 205 is provided such that the outer edge portion 205c is located at the downstream end of the passage wall 3b when the valve is closed. According to this configuration, the valve body 205 blocks the passage wall 3b from the downstream passage when the valve is closed, so that the exhaust gas flowing backward through the downstream passage contacts the passage wall 3b. Can be suppressed. Therefore, the foreign matter is less likely to adhere to the passage wall 3b in the valve closed state, so it is possible to provide the fluid control valve device capable of suppressing the accumulation of the foreign matter.

Fifth Embodiment
In the fifth embodiment, a valve body 305 which is another form of the valve body of the above-described embodiment will be described with reference to FIG. In FIG. 9, the same components as those of the above-described embodiment are denoted by the same reference numerals and the same operations and effects can be obtained. The configurations, operations, and effects not particularly described in the fifth embodiment are the same as those in the above-described embodiments, and only differences from the first, third, and fourth embodiments will be described below.

  FIG. 9 is a bottom view of the valve body 305 as viewed from the downstream side. The valve body 305 is provided with an outer edge portion 305c which is partially provided at circumferential intervals. At the downstream end of the cylindrical portion of the valve body 305, an outer edge portion 305c protruding radially outward from the cylindrical portion and a portion 305d in which the outer edge portion 305c does not exist are alternately provided over the entire circumference. The valve body 305 partially has an outer edge portion 305 c all around. The outer edge portion 305 c can also be formed by partially cutting the outer peripheral edge of the valve body 305.

  According to the fluid control valve device of the fifth embodiment, the valve body 305 has the outer edge portion 305c which contacts the passage wall 3b at intervals in the circumferential direction in a state where the exhaust pressure acts on the valve body 305. doing. According to this configuration, the outer edge portion 305c partially provided in the circumferential direction of the valve body 305 can strengthen the force for scraping out the deposit on the passage wall 3b when moving the valve body 305 in the valve opening direction. Body 305 can be provided.

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

  As shown in FIG. 10, when the valve body in the above-described embodiment is positioned between the fully open state and the valve closed state in which the valve body is displaced to the maximum valve opening side, the outer edge portion 5c is the passage wall. It may be configured to be in contact with 3b. According to this, since the outer edge 5c is displaced so as to rub the passage wall 3b even when the valve body is displaced to the valve opening side from the state between the fully open state and the closed state, adhesion to the passage wall 3b The foreign substance which is being carried out can be scraped off by the outer edge 5c. Therefore, it is possible to provide a valve body capable of removing the deposit on the passage wall 3b in a wide operation range.

  Although each valve body described in the above embodiment is formed of an elastically deformable material, a fluid control valve device that can achieve the purpose disclosed in the specification is formed of a material that is not easily elastically deformed. It may be provided with a valve body. Even in such a valve body, if the outer edge portion is provided so as to rub against the passage wall 3b in the valve opening operation, the outer edge portion has a function of removing the deposits on the passage wall 3b. It can be demonstrated.

Reference Signs List 2 housing 3a valve seat (valve seat) 3b passage wall 3c downstream end wall (inner wall) 5, 105, 205, 305 valve body 5c 105c 205c 305c outer edge 10 engine 43: Air passage port (downstream side passage) 55: Air passage port (fluid passage port)
56 ... Communication passage (passage)

Claims (9)

A housing (2) having therein an annular valve seat (3a) in which a fluid passage (55) through which the fluid flows down is formed;
A valve body (5; 205; 305) capable of opening and closing the fluid passage by closing the valve seat in contact with the valve seat and opening the valve apart from the valve seat;
A passage wall (3b) extending from the periphery of the valve seat to the downstream side of the fluid flow so as to form a passage (56) in communication with the fluid passage port;
Equipped with
The valve body has an outer edge (5c; 205c; 305c) that comes in contact with the passage wall in a state where exhaust pressure generated by backflow of exhaust gas of the engine (10) acts on the valve body. Fluid control valve device.   The fluid control valve device according to claim 1, wherein the outer edge portion (205c) is shaped so as to extend toward the downstream side toward the tip when the valve body is in the open state.   The fluid control valve device according to claim 1 or 2, wherein the outer edge portion (5c; 205c) has a shape in which the thickness dimension at the tip end side is smaller than that at the root side.   The fluid control valve device according to claim 3, wherein the outer edge portion (205c) has a tapered shape in which a longitudinal cross-sectional shape is tapered toward a tip.   The said valve body is provided so that the said outer edge part may be located in the downstream end of the said passage wall, when the said valve body is a valve closing state, in any one of the Claims 1-4 Fluid control valve device as described.   The valve body (5; 205) has the outer edge (5c; 205c) contacting the passage wall all around the valve body in a state where the exhaust pressure acts on the valve body The fluid control valve device according to any one of claims 1 to 5.   The valve body (305) has the outer edge (305c) contacting the passage wall at intervals in the circumferential direction in a state where the exhaust pressure acts on the valve body. The fluid control valve device according to any one of claims 5 to 10.   The valve body is provided such that the outer edge portion contacts the passage wall when the valve body is positioned between a fully open state and a closed state in which the valve body is displaced to the maximum valve opening side. The fluid control valve device according to any one of claims 1 to 7. A housing (2) having therein an annular valve seat (3a) in which a fluid passage (55) through which the fluid flows down is formed;
A valve body (105) capable of opening and closing the fluid passage port by closing the valve seat in contact with the valve seat and opening the valve apart from the valve seat;
A passage wall (3b) extending downstream from the periphery of the valve seat so as to form a passage (56) in communication with the fluid passage port;
Equipped with
The valve body is configured to block the passage wall with respect to the downstream passage (43) located closer to the engine (10) than the passage wall when the valve body is in a closed state. Fluid control valve arrangement having an outer edge (105c) in contact with the inner wall (3c).

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