JP6930438B2 - Flow control device - Google Patents

Description

The disclosure in this specification relates to a throttle valve device for controlling the flow rate of evaporated fuel and a flow rate adjusting device including the throttle valve device.

Patent Document 1 discloses a purge valve which is a solenoid valve capable of adjusting the flow rate of evaporated fuel flowing from the canister side to the intake pipe side of the engine.

Japanese Unexamined Patent Publication No. 2008-291916

When the pressure fluctuation between the purge valve and the canister becomes large, the amplitude of the piping, the canister, etc. connected to the purge valve becomes large, and the vibration, the sound, etc. transmitted to the vehicle interior through these become large. Therefore, the purge valve described in Patent Document 1 reduces the pulsation invading the input port because the pressure wave from the chamber of the apparatus toward the input port is obstructed by the column member having a large CD value in the counterflow direction when the valve is closed. It has a function.

According to this conventional technique, the column member has a shape in which the CD value is small in the forward flow direction of the fluid from the inflow port to the valve port, but it is an obstacle that becomes resistance when the fluid flows to the engine side at low negative pressure. Therefore, there is a problem that the flow rate decreases when the engine negative pressure is high.

An object of the disclosure in this specification is to provide a throttle valve device capable of suppressing flow resistance at low negative pressure and reducing noise due to pressure fluctuation at high negative pressure, and a flow rate adjusting device including the same. ..

The plurality of aspects disclosed herein employ different technical means to achieve their respective objectives. Further, the scope of claims and the reference numerals in parentheses described in this section are examples showing the correspondence with the specific means described in the embodiment described later as one embodiment, and limit the technical scope. is not it.

The disclosed flow rate adjusting devices include a purge valve that adjusts the flow rate of evaporated fuel that flows out of the canister (13) and flows toward the engine by the intake pressure of the engine (2), and a throttle valve provided on the canister side of the purge valve. In the flow rate adjusting device including the device (16; 1016),
The purge valve has a valve body (152) that opens and closes a valve opening so as to switch between a valve open state that allows the flow of evaporated fuel and a valve closed state that blocks the flow of evaporated fuel, and a valve open state and a valve closed state. It is equipped with an electromagnetic solenoid unit (151) that generates a driving force that drives a movable core (1511) that is displaced together with the valve body in the axial direction for switching.
The throttle valve device is a negative pressure sensing passage provided so as to communicate with an engine side passage (156a; 157a; 167a) located closer to the engine than the valve opening (153) at which the valve body (152) of the purge valve opens and closes. (164a), a negative pressure sensing unit (162; 165) provided in the negative pressure sensing passage or in a portion communicating with the negative pressure sensing passage and operating by the pressure of the engine side passage, and the valve port. When it is provided in the inflow side passage (154a; 158a; 166a) located on the canister side, the valve body is in the closed state, and the engine side passage has a negative pressure than the portion where the negative pressure sensing portion is provided. It is provided with a throttle valve portion (161) that is displaced according to the operation of the negative pressure sensing portion to narrow the flow path crossing area in the inflow side passage.
It has an inflow side passage and a valve port inside, and includes a housing (150) that houses a purge valve and a throttle valve device .

According to this flow rate adjusting device, when the purge valve is closed and the engine negative pressure is high, the throttle valve device narrows the passage crossing area of the inflow side passage, so that the pressure fluctuation in the inflow side passage can be suppressed. .. As a result, it is possible to suppress the fluctuation range of the pressure propagating from the passage in the housing to the canister side through the inflow side passage. Since the throttle valve portion has a structure that is displaced so as to narrow the passage according to the operation of the negative pressure sensing portion when the engine side passage has a negative pressure, the inflow side passage is opened when the flow rate adjusting device is open. The distribution resistance of the circulating vaporized fuel can be reduced. As described above, it is possible to provide a flow rate adjusting device capable of suppressing the flow resistance at the time of low negative pressure and reducing noise and the like due to pressure fluctuation at the time of high negative pressure.

It is a figure which showed the evaporative fuel processing apparatus provided with the flow rate adjusting apparatus of 1st Embodiment. It is a schematic diagram which showed the structure and the state at the time of low negative pressure about the throttle valve device which the flow rate adjustment device of 1st Embodiment has. It is a schematic diagram which showed the state at the time of high negative pressure about the throttle valve device which the flow rate adjustment device of 1st Embodiment has. It is a partial cross-sectional view which showed the valve body position of the throttle valve device at the time of high negative pressure of FIG. It is a graph which showed the relationship between the engine negative pressure and the pressure fluctuation about a conventional product and an embodiment product. It is a schematic diagram which showed the structure and the state at the time of a high negative pressure about the throttle valve device which the flow rate adjustment device of 2nd Embodiment has. It is a schematic diagram which showed the structure and the state at the time of a high negative pressure about the throttle valve device which the flow rate adjustment device of 3rd Embodiment has. It is a schematic diagram which showed the structure and the state at the time of a high negative pressure about the throttle valve device which the flow rate adjustment device of 4th Embodiment has. It is a schematic diagram which showed the structure and the state at the time of a high negative pressure about the throttle valve device connected to the purge valve of 5th Embodiment.

Hereinafter, a plurality of modes for carrying out the present disclosure will be described with reference to the drawings. In each form, the same reference numerals may be attached to the parts corresponding to the items described in the preceding forms, and duplicate explanations may be omitted. When only a part of the configuration is described in each form, the other forms described above can be applied to the other parts of the configuration. Not only the combinations of the parts that clearly indicate that they can be combined in each embodiment, but also the parts of the embodiments that are not explicitly combined unless there is a problem in the combination. It is also possible.

(First Embodiment)
The first embodiment will be described with reference to FIGS. 1 to 5. The flow rate adjusting device 15 is used in the evaporative fuel processing device 1 which is an evaporative fuel purging system mounted on a vehicle. As shown in FIG. 1, the evaporated fuel processing apparatus 1 supplies HC gas or the like in the fuel adsorbed on the canister 13 to the intake passage of the engine 2, and the evaporated fuel from the fuel tank 10 is released to the atmosphere. To prevent. The evaporative fuel processing device 1 includes an intake system of the engine 2 that constitutes an intake passage of the engine 2 that is an internal combustion engine, and an evaporative fuel purge system that supplies the evaporated fuel to the intake system of the engine 2.

The evaporated fuel introduced into the intake passage by the intake pressure of the engine 2 is mixed with the combustion fuel supplied to the engine 2 from the injector or the like and burned in the combustion chamber of the engine 2. The engine 2 mixes and burns at least the evaporated fuel desorbed from the canister 13 and the combustion fuel. The intake system of the engine 2 is configured such that an intake pipe 21 constituting an intake passage is connected to an intake manifold 20 and a throttle valve 25, an air filter 24 and the like are provided in the middle of the intake pipe 21.

In the evaporative fuel purge system, the fuel tank 10 and the canister 13 are connected by a pipe 11 forming a vapor passage, and the canister 13 and the intake pipe 21 are connected via a pipe 14 forming a purge passage and a flow rate adjusting device 15. There is. A purge pump may be provided in the middle of the purge passage. The air filter 24 is provided in the upstream portion of the intake pipe 21 and captures dust, dust, etc. in the intake pipe. The throttle valve 25 is an intake air amount adjusting valve that adjusts the opening degree of the inlet portion of the intake manifold 20 to adjust the intake air amount flowing into the intake manifold 20. The intake air passes through the intake air passage, flows into the intake manifold 20, is mixed with the combustion fuel injected from the injector or the like so as to have a predetermined air-fuel ratio, and is burned in the combustion chamber.

The fuel tank 10 is a container for storing fuel such as gasoline. The fuel tank 10 is connected to the inflow portion of the canister 13 by a pipe 11 forming a vapor passage. The canister 13 is a container in which an adsorbent such as activated carbon is sealed, and the evaporated fuel generated in the fuel tank 10 is taken in through the vapor passage and temporarily adsorbed on the adsorbent.

A valve module 12 is integrally provided on the canister 13. The valve module 12 includes a canister closed valve that opens and closes a suction unit for sucking in fresh air from the outside, and an internal pump that can release gas to the atmosphere and suck in the atmosphere. It is built-in. When the canister 13 is provided with the canister close valve, atmospheric pressure can be applied to the inside of the canister 13. The canister 13 can easily desorb, that is, purge the evaporated fuel adsorbed on the adsorbent by the sucked fresh air.

The flow rate adjusting device 15 includes a purge valve and a throttle valve device 16. The purge valve includes a purge passage, that is, a valve body 152 for opening and closing a valve opening included in a fuel passage 153 provided inside a housing 150 forming a flow rate adjusting device 15, and an urging member. The valve port is part of a fuel passage 153 that is opened and closed by the valve body 152. The purge valve is an example of a flow rate adjusting device capable of permitting and blocking the supply of evaporative fuel from the canister 13 to the engine 2. The purge valve is a valve device that keeps the fuel passage 153 closed during normal times when no voltage is supplied. The purge valve is in a valve closed state in which the valve body 152 is urged toward the valve opening side by an urging member such as a spring to close the fuel passage 153 when no voltage is applied, and the fuel passage is closed when a voltage is applied. It is a normally closed type valve device controlled to open the valve 153. By switching between the valve open state and the valve closed state in this way, the purge valve can adjust the purge amount of the evaporated fuel in the evaporated fuel processing apparatus 1.

In recent years, the negative pressure of the engine has tended to decrease due to the fuel efficiency of the engine, and the purge valve is required to have a performance capable of adjusting a large flow rate. On the other hand, it is known that the fluctuation range of the pressure when the valve body of the purge valve moves from the valve open state to the valve closed state increases as the maximum adjustable flow rate in the purge valve increases. Therefore, the larger the adjustable flow rate value of the purge valve, the larger the fluctuation range of the pressure between the purge valve and the canister 13, and this phenomenon causes noise in the vehicle. Since the piping connecting the purge valve and the canister 13 is provided under the floor in the vehicle interior, for example, noise due to vibration of the piping is easily transmitted to the vehicle interior. The evaporative fuel processing device 1 of this embodiment has a function of suppressing the pressure fluctuation range.

As shown in FIG. 2, the purge valve included in the flow rate adjusting device 15 includes a valve seat 155, a valve body 152, an electromagnetic solenoid unit 151, and the like. The electromagnetic solenoid unit 151 includes a yoke, a bobbin, a coil 1510, a fixed core, a movable core 1511, a connector for power supply, and the like. The yoke, fixed core, movable core 1511 and the like are made of a magnetic material. The electromagnetic solenoid unit 151 is configured so that the current energizing the coil 1510 can be controlled by electrically connecting the terminal terminal to the control device 50 or the like that controls the supply voltage with a connector.

The electromagnetic solenoid unit 151 is used to switch between a valve open state in which the valve body 152 is separated from the valve seat 155 to allow fluid flow and a valve closed state in which the valve body 152 contacts the valve seat 155 to prevent fluid flow. A driving force is generated to drive the movable core 1511, which is displaced integrally with the body 152, in the axial direction. When the coil 1510 of the electromagnetic solenoid unit 151 is energized from the valve closed state, magnetic flux is generated in the magnetic circuit formed by the yoke, the movable core 1511, the fixed core, and the like. Due to the magnetic force associated with this magnetic flux, the movable core 1511 is attracted axially toward the fixed core side and moves toward the fixed core side against the urging force of the urging member, and the valve body 152 moves to the fixed core side, and the valve body 152 moves to the valve seat 155. The valve is opened and the fuel passage 153 is opened.

The control device 50 has at least one arithmetic processing unit (CPU) and at least one memory device as a storage medium for storing programs and data. The control device 50 is provided by a microcomputer having a storage medium that can be read by a computer, for example. A storage medium is a non-transitional substantive storage medium that stores a computer-readable program non-temporarily. The storage medium may be provided by a semiconductor memory, a magnetic disk, or the like. The control device 50 may be provided by a single computer, or a set of computer resources linked by a data communication device. By being executed by the control device 50, the program causes the control device 50 to function as the device described herein, and the control device 50 to perform the methods described herein.

The means and / or functions provided by the control device 50 can be provided by software recorded in a substantive memory device and a computer, software only, hardware only, or a combination thereof that executes the software. For example, if the control device 50 is provided by an electronic circuit that is hardware, it can be provided by a digital circuit or an analog circuit that includes a large number of logic circuits.

For example, the control device 50 controls the ratio of the on-time to the time of one cycle formed by the on-time and the off-time of energization, that is, the duty ratio, and energizes the coil 1510. The purge valve is also called a duty control valve. The purge valve can continuously control the valve opening amount by changing the duty ratio controlled by the duty signal. By this energization control, the flow rate (purge amount) of the evaporated fuel flowing through the fuel passage 153 can be adjusted.

The purge valve housing 150 is provided with an input port 154 that receives a fluid supply from the canister 13 side and an output port 156 that allows the fluid to flow out to the engine 2 side. The passage in the output port 156 is an engine-side passage 156a located closer to the engine 2 than the fuel passage 153. The housing 150 houses the electromagnetic solenoid unit 151, the valve body 152, and the like. The inflow side passage 154a provided inside the input port 154 communicates with the canister 13 via a pipe 14 connected to the canister 13. The inflow side passage 154a is a passage located on the canister 13 side of the valve opening and the valve body 152. The flow path crossing area of the inflow side passage 154a is narrowed by the throttle valve device 16 when the intake pressure of the engine 2 brings about a high negative pressure state. The throttle valve device 16 is a device capable of increasing the flow resistance by sensing pressure and operating to throttle the flow path on the canister 13 side of the purge valve, that is, on the upstream side of the evaporated fuel flow.

As shown in FIG. 2, the throttle valve device 16 is housed in the housing 150. The throttle valve device 16 is provided in the inflow side passage 154a in the input port 154 provided in the housing 150. The throttle valve device 16 includes a throttle valve portion 161 provided so as to cross the inflow side passage 154a. The throttle valve portion 161 is a movable member provided with a throttle passage 161a constituting the flow path and displaceable in a direction intersecting the inflow side passage 154a. The throttle valve portion 161 is a circular or square columnar member or plate-shaped member. The throttle passage 161a is formed by a through hole portion that penetrates the throttle valve portion 161 in the direction along the inflow side passage 154a. The throttle passage 161a has a passage crossing area equal to or larger than that of the inflow side passage 154a.

The housing 150 communicates with the inflow side passage 154a and is provided with a chamber portion on the outside of the inflow side passage 154a. The throttle valve portion 161 is integrally supported by the housing 150 by the film-like body 162. The outer edge portion of the film-like body 162 is fixed to the portion forming the chamber portion in the housing 150, and the inner edge portion is fixed to the throttle valve portion 161 to connect the throttle valve portion 161 and the housing 150. The membranous body 162 is provided so as to cross the chamber portion. The membranous body 162 also functions as a blocking film that blocks airflow between the inflow side passage 154a and the negative pressure sensing passage 164a. The film-like body 162 is elastically deformable, and the throttle valve portion 161 can be displaced in the housing 150 by elastically deforming the film-like body 162. The film-like body 162 can be formed of metal or resin. The membranous body 162 can be elastically deformed by the pressure acting on the surface, and can also be composed of a diaphragm.

The throttle valve portion 161 is also supported by an elastic body 163 interposed between the throttle valve portion 161 and the housing 150. The elastic body 163 is a member that can be expanded and contracted in a direction intersecting the inflow side passage 154a, and supports the throttle valve portion 161 in a displaceable direction in this direction. The elastic body 163 urges the throttle valve portion 161 so that the passage shaft of the throttle passage 161a and the passage shaft of the inflow side passage 154a are in a coaxial state or a state close to that state. Therefore, the elastic body 163 supports the throttle valve portion 161 so as to be displaceable in the direction intersecting the inflow side passage 154a, and the film-like body 162 is the throttle valve portion in the direction orthogonal to the direction supported by the elastic body 163. It supports 161. The elastic body 163 can be composed of, for example, a coil spring, a leaf spring, an elastic packing, rubber, or the like. It is preferable that the elasticity of the film-like body 162 and the elastic body 163 is set so as to have an appropriate elastic force so as not to be sensitively interlocked with a small fluctuation of the negative pressure of the engine 2.

The flow rate adjusting device 15 includes a negative pressure sensing member 164 having a negative pressure sensing passage 164a inside that connects the chamber portion and the engine side passage 156a. Since the negative pressure sensing passage 164a communicates with the engine side passage 156a, the intake pressure of the engine 2 acts on the negative pressure sensing passage 164a through the engine side passage 156a when the purge valve is in the closed state. Since the negative pressure sensing passage 164a communicates with the chamber portion, the negative pressure due to the intake pressure of the engine 2 acts on the film-like body 162 existing in the chamber portion. As described above, the film-like body 162 is a negative pressure sensing unit that is elastically deformed by the front-rear differential pressure and operates based on the pressure of the engine-side passage 156a.

The throttle valve device 16 can switch the inflow side passage 154a between a fully open state and a throttle state with respect to the flow path crossing area of the inflow side passage 154a according to the intake pressure of the engine 2. The fully open state is when the intake pressure of the engine 2 is low, and as shown in FIG. 2, the passage shaft of the throttle passage 161a and the passage shaft of the inflow side passage 154a are in a coaxial state or a state close to that state. be. The throttle state is when the intake pressure of the engine 2 is a high load, and as shown in FIGS. 3 and 4, the throttle valve portion 161 is attracted to the negative pressure sensing passage 164a side, and the passage shaft of the throttle passage 161a. And the passage axis of the inflow side passage 154a are largely deviated from each other.

When the throttle valve device 16 is in the fully open state, the pressure fluctuation propagating from the valve body 152 to the inflow side passage 154a is on the canister 13 side without reducing the amplitude in the inflow side passage 154a as shown by the solid line in FIG. It is transmitted to the passage. When the throttle valve device 16 is in the throttle state, the pressure fluctuation propagating from the valve body 152 to the inflow side passage 154a passes through the passage narrowed by the throttle valve portion 161 as shown by the solid line in FIG. The amplitude becomes smaller and is transmitted to the passage on the canister 13 side. The fully open state corresponds to the running of a vehicle in which the noise level in the vehicle interior is high, and contributes to increasing the flow rate of the evaporated fuel at this time. The throttle state is during idling when the intake pressure of the engine 2 tends to be high and the noise level in the vehicle interior is low. At this time, the pressure fluctuation transmitted to the passage on the canister 13 side is suppressed, so that the pulsation in the passage is suppressed. It can be reduced to prevent noise.

The graph of FIG. 5 shows the results of examining the relationship between the negative pressure of the engine 2 and the pressure fluctuation in the passage on the canister 13 side for the conventional product and the embodiment product. As shown in FIG. 5, as the negative pressure of the engine 2 increases, the magnitude of the pressure fluctuation increases when the throttle valve device 16 is in the fully open state, and is not much different from the conventional product. Further, when the negative pressure of the engine 2 becomes large, the conventional product continues to rise, and problems such as noise exceeding the upper limit value line occur. On the other hand, in the embodiment product, when the throttle valve device 16 exceeds the valve throttle point, which is a negative pressure that shifts from the fully open state to the throttle state, the throttle valve portion 161 narrows the flow path cross-sectional area in the inflow side passage 154a. Therefore, the pressure fluctuation turns downward and decreases. In this way, the throttle valve device 16 suppresses pressure fluctuations at the time of high negative pressure by shifting from the fully open state to the throttle state, so that vibration, noise, and the like can be reduced.

The action and effect brought about by the first embodiment will be described. The throttle valve device 16 is a device provided on the canister 13 side of the purge valve that adjusts the flow rate of the evaporated fuel that flows out of the canister 13 due to the intake pressure of the engine 2 and flows toward the engine 2. The throttle valve device 16 includes a negative pressure sensing passage 164a, a negative pressure sensing portion, and a throttle valve portion 161. The negative pressure sensing passage 164a is provided so as to communicate with the engine side passage 156a located closer to the engine 2 than the valve opening where the valve body 152 of the purge valve opens and closes. The negative pressure sensing unit is provided at a portion communicating with the negative pressure sensing passage 164a, and operates by the pressure of the engine side passage 156a. The throttle valve portion 161 is provided in the inflow side passage 154a located on the canister 13 side of the valve port. The throttle valve portion 161 is displaced according to the operation of the negative pressure sensing portion when the valve body 152 is in the closed state and the engine side passage 156a has a negative pressure than the portion where the negative pressure sensing portion is provided. As a result, the cross-flow area of the inflow-side passage 154a is narrowed.

According to this throttle valve device 16, when the purge valve is closed and the engine negative pressure is high, the throttle valve portion 161 narrows the flow path crossing area of the inflow side passage 154a, so that the pressure fluctuation in the inflow side passage 154a Can be suppressed. By this action, the fluctuation range of the pressure propagating from the fuel passage 153 in the purge valve to the canister 13 side through the inflow side passage 154a can be suppressed. The throttle valve portion 161 has a structure in which when the engine side passage 156a has a negative pressure when the purge valve is closed, the throttle valve portion 161 is displaced so as to narrow the inflow side passage according to the operation of the negative pressure sensing portion. Occasionally, the flow resistance of the evaporated fuel flowing through the inflow side passage 154a can be reduced. From the above, the throttle valve device 16 can suppress the flow resistance at the time of low negative pressure and reduce the noise and the like due to the pressure fluctuation at the time of high negative pressure. Contributes to suppressing vibration and noise transmitted to the room.

Further, since the flow rate adjusting device 15 has a configuration capable of suppressing the fluctuation range of the pressure without having a large space, it is possible to suppress the increase in size of the device and improve the vehicle mountability. According to the flow rate adjusting device 15, it is possible to provide the evaporated fuel processing device 1 in which a large flow rate can be controlled by the purge valve and the pressure fluctuation width in the pipe on the canister 13 side can be suppressed by the throttle valve device 16.

The negative pressure sensing passage 164a is a passage connecting the engine side passage 156a and the inflow side passage 154a. According to this configuration, by providing the negative pressure sensing member 164 forming the negative pressure sensing passage 164a, it is possible to provide a device capable of sensing the intake pressure of the engine 2 with a simple configuration, and a device capable of suppressing pressure fluctuations. Contributes to suppressing the increase in size.

The negative pressure sensing unit is a film-like body 162 provided so as to cross the chamber portion communicating with the negative pressure sensing passage 164a. The throttle valve portion 161 is displaced when the film-like body 162 is in an elastically deformed state of bending toward the negative pressure sensing passage 164a, and narrows the flow path cross-sectional area in the inflow side passage 154a. According to this configuration, the flow rate adjusting device 15 is provided with a chamber portion for installing the film-like body 162 and a negative pressure sensing passage 164a for connecting the chamber portion and the engine side passage 156a, thereby increasing the height of the engine 2. It is possible to provide a device that suppresses pressure fluctuations that may occur at the time of negative pressure. In other words, since the throttle valve device 16 operates according to the intake pressure of the engine 2, it is not necessary to construct a control configuration for controlling the timing of opening and closing the throttle valve. Can be provided.

The throttle valve portion 161 is provided with a throttle passage 161a having a passage crossing area equal to or larger than that of the inflow side passage 154a. As shown in FIGS. 3 and 4, when the throttle valve portion 161a is displaced with respect to the inflow side passage 154a in the displacement direction of the throttle valve portion 161, the throttle valve portion 161 has a flow path crossing area in the inflow side passage 154a. Narrow. According to this configuration, when the purge valve is closed and the engine negative pressure is high, the throttle valve portion 161a is displaced from the inflow side passage 154a in the displacement direction of the throttle valve portion 161. Narrows the flow path crossing area of the inflow side passage 154a. Further, since the throttle valve portion 161 includes a throttle passage 161a having a passage crossing area equal to or larger than that of the inflow side passage 154a, the flow resistance of the evaporated fuel flowing through the inflow side passage 154a when the purge valve is opened can be reduced. Therefore, the flow rate adjusting device 15 capable of sensing the intake pressure of the engine 2 can be provided by a simple configuration, which contributes to suppressing the increase in size of the device capable of suppressing the pressure fluctuation.

The flow rate adjusting device 15 includes a throttle valve device 16, a housing 150 having an inflow side passage 154a and a valve opening inside, and a valve body 152 that opens and closes the valve opening so as to switch between a valve opening state and a valve closing state. It includes an electromagnetic solenoid unit 151 that generates a driving force that drives the movable core 1511 in the axial direction. According to the flow rate adjusting device 15, when the valve is closed and the engine negative pressure is high, the throttle valve device 16 narrows the passage crossing area of the inflow side passage 154a, so that the pressure fluctuation in the inflow side passage 154a can be suppressed. .. By this action, the fluctuation range of the pressure propagating from the passage in the housing 150 to the canister 13 side through the inflow side passage 154a can be suppressed. Since the throttle valve portion 161 has a structure in which the passage 156a on the engine side is displaced so as to narrow the passage according to the operation of the negative pressure sensing portion when the negative pressure is applied, the flow adjusting device 15 flows in when the valve is open. The flow resistance in the side passage 154a can be reduced. From the above, the flow rate adjusting device 15 can suppress the flow resistance at the time of low negative pressure and reduce the noise due to the pressure fluctuation at the time of high negative pressure. Contributes to suppressing vibration and noise transmitted to the room.

(Second Embodiment)
The flow rate adjusting device 15 of the second embodiment will be described with reference to FIG. In the second embodiment, the configuration of the throttle valve device 1016 is different from that in the first embodiment. The configuration, action, and effect not particularly described in the second embodiment are the same as those in the first embodiment. Hereinafter, the differences from the first embodiment will be described.

As shown in FIG. 6, the throttle valve device 1016 includes a film-like body 165 provided as a negative pressure sensing unit so as to cross the negative pressure sensing passage 164a. The throttle valve portion 161 is displaced when the film-like body 165 is in an elastically deformed state of bending in the engine-side passage 156a, and narrows the flow path cross-sectional area in the inflow-side passage 154a. The throttle passage 161a included in the devices of the second to fifth embodiments is a passage formed between the passage wall forming the inflow side passage and the throttle valve portion 161, and is accompanied by the displacement of the throttle valve portion 161. The crossing area of the passage is changing.

The throttle valve device 1016 is housed in the housing 150. The throttle valve device 1016 is provided in the inflow side passage 154a in the input port 154 provided in the housing 150. The throttle valve portion 161 is a movable member that can be displaced in a direction intersecting the inflow side passage 154a. The throttle valve portion 161 is supported by a support member 165a having one end coupled to the film-like body 165 and the other end coupled to the throttle valve portion 161. The support member 165a is, for example, a rod-shaped member, and can be made of a wire or the like that does not easily deform.

The film-like body 165 can be elastically deformed by the pressure acting on the surface like the film-like body 162 of the first embodiment. The throttle valve portion 161 can be displaced in the housing 150 by the support member 165a being displaced as the film-like body 165 is elastically deformed. The membranous body 165 can also be composed of a diaphragm like the membranous body 162.

The elastic body 163 urges the throttle valve portion 161 so that the flow path cross-sectional area in the inflow side passage 154a is not narrowed by the throttle valve portion 161 at the time of low negative pressure. The film-like body 165 and the elastic body 163 support the throttle valve portion 161 so as to be displaceable in a direction intersecting the inflow side passage 154a. It is preferable that the elasticity of the film-like body 165 and the elastic body 163 is set so as to have an appropriate elastic force so as not to be sensitively interlocked with a small fluctuation of the negative pressure of the engine 2.

According to the throttle valve device 1016 of the second embodiment, the negative pressure sensing unit is provided so as to cross the negative pressure sensing passage 164a and operates by the pressure of the engine side passage 156a. According to this configuration, by installing the film-like body 165 in the negative pressure sensing passage 164a, the space for mounting the throttle valve device 1016 can be suppressed, and the throttle valve device contributes to the miniaturization of the flow rate adjusting device 15. 1016 can be provided.

(Third Embodiment)
The flow rate adjusting device 15 of the third embodiment will be described with reference to FIG. 7. In the third embodiment, the configuration of the output port 157 is different from that in the second embodiment. The configuration, action, and effect not particularly described in the third embodiment are the same as those in the above-described embodiment. Hereinafter, differences from the above-described embodiment will be described.

As shown in FIG. 7, the output port 157 from which the fluid flows out to the engine 2 side extends along the input port 154. The passage in the output port 157 is an engine-side passage 157a located closer to the engine 2 than the fuel passage 153. The engine-side passage 157a bends outside the housing 150 and extends along the inflow-side passage 154a. According to the flow rate adjusting device 15 of the third embodiment, the negative pressure sensing passage 164a can be configured to be short, which also contributes to suppressing the physique of the flow rate adjusting device 15 as a whole.

(Fourth Embodiment)
The flow rate adjusting device 15 of the fourth embodiment will be described with reference to FIG. In the fourth embodiment, the configuration of the input port 158 is different from that in the second embodiment. The configuration, action, and effect not particularly described in the fourth embodiment are the same as those in the above-described embodiment. Hereinafter, differences from the above-described embodiment will be described.

As shown in FIG. 8, the input port 158 extends along the output port 156. The passage in the input port 158 is an inflow side passage 158a. The inflow side passage 158a extends along the engine side passage 156a. According to the flow rate adjusting device 15 of the fourth embodiment, the negative pressure sensing passage 164a can be configured to be short, which also contributes to suppressing the physique of the flow rate adjusting device 15 as a whole.

(Fifth Embodiment)
A fifth embodiment will be described with reference to FIG. The fifth embodiment is different from the second embodiment in that the throttle valve device 2016 is connected to the input port 159 and the output port 156 of the purge valve 1015. The configuration, action, and effect not particularly described in the fifth embodiment are the same as those in the above-described embodiment. Hereinafter, differences from the above-described embodiment will be described.

As shown in FIG. 9, the throttle valve device 2016 is a negative pressure sensing member that connects an inflow side member 166 accommodating a throttle valve portion 161, an engine side member 167, and an inflow side member 166 and an engine side member 167. It is equipped with 164 and. The inflow side member 166 is connected to the input port 159, and the engine side member 167 is connected to the output port 156. As a result, the inflow side passage 166a in the inflow side member 166 communicates with the inflow side passage 159a in the input port 159, and the flow path crossing area is narrowed by the throttle valve portion 161 at the time of high negative pressure. The engine-side passage 167a in the engine-side member 167 communicates with the engine-side passage 156a in the output port 156, and communicates with the inflow-side passage 166a through the negative pressure sensing passage 164a.

According to the fifth embodiment, the purge valve 1015 and the throttle valve device 2016 are configured as separate devices, and by connecting them, the existing purge valve is equipped with the throttle valve device 2016 having a pressure fluctuation suppressing function. The evaporated fuel processing apparatus 1 can be provided.

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

As shown in the second to fifth embodiments, the throttle valve portion 161 of the first embodiment is configured to be displaced according to the deformed state of the film-like body 165 provided in the negative pressure sensing passage 164a. You may.

The purge valve 1015 and the throttle valve device 2016 of the fifth embodiment may be configured such that the engine side passage 167a and the inflow side passage 166a extend in parallel as in the third embodiment and the fourth embodiment.

In the above-described embodiment, the control device 50 controls the ratio of the on-time to the time of one cycle formed by the on-time and the off-time of energization, that is, the duty ratio, and supplies power to the purge valve. , Not limited to such power supply. For example, the purge valve may be configured to be controlled by on / off control in which either an on state in which a predetermined voltage value is supplied or an off state in which power is not supplied is selected according to a measured value.

2 ... Engine, 13 ... Canister, 15 ... Flow rate regulator 1015 ... Purge valve, 16,1016, 2016 ... Squeeze valve device 150 ... Housing, 152 ... Valve body, 153 ... Fuel passage (valve port)
154a, 158a, 166a ... Inflow side passage 156a, 157a, 167a ... Engine side passage 161 ... Squeeze valve part, 162, 165 ... Membrane-like body (negative pressure sensing part)
164a ... Negative pressure sensing passage

Claims (7)

A purge valve that adjusts the flow rate of evaporated fuel that flows out of the canister (13) due to the intake pressure of the engine (2) and flows toward the engine .
In a flow rate adjusting device including a throttle valve device (16; 1016) provided on the canister side of the purge valve.
The purge valve is
A valve body (152) that opens and closes the valve opening so as to switch between a valve open state that allows the flow of evaporated fuel and a valve closed state that blocks the flow of evaporated fuel.
In order to switch between the valve open state and the valve closed state, an electromagnetic solenoid unit (151) that generates a driving force that drives a movable core (1511) that is displaced together with the valve body in the axial direction is provided.
The throttle valve device is
The valve port engine side passage located at the engine closer than (153), wherein said valve body of the purge valve (152) is opened and closed (156a; 157a; 167a) negative pressure sensing passage which is provided so as to communicate with the ( 164a) and
A negative pressure sensing unit (162; 165) provided in the negative pressure sensing passage or in a portion communicating with the negative pressure sensing passage and operating by the pressure of the engine side passage.
It is provided in the inflow side passage (154a; 158a; 166a) located on the canister side of the valve port, and is on the engine side of the portion where the valve body is closed and the negative pressure sensing portion is provided. When the passage has a negative pressure, it is provided with a throttle valve portion (161) that is displaced according to the operation of the negative pressure sensing portion to narrow the flow passage crossing area in the inflow side passage.
A flow rate adjusting device including a housing (150) having the inflow side passage and the valve port inside, and accommodating the purge valve and the throttle valve device . The flow rate adjusting device according to claim 1, wherein the negative pressure sensing passage is a passage connecting the engine side passage and the inflow side passage. The negative pressure sensing portion is a film-like body (162) provided so as to cross the chamber portion communicating with the negative pressure sensing passage.
According to claim 1 or 2, the throttle valve portion is displaced when the membrane-like body is in an elastically deformed state of bending toward the negative pressure sensing passage side to narrow the flow path crossing area in the inflow side passage. The flow rate regulator according to the description. The negative pressure sensing unit is a film-like body (165) provided so as to cross the negative pressure sensing passage.
The throttle valve portion according to claim 1 or 2, wherein the film-like body is displaced when it is in an elastically deformed state of bending toward the engine side passage side to narrow the flow path crossing area in the inflow side passage. Flow control device . The throttle valve portion is provided with a throttle passage (161a) having a passage crossing area equal to or larger than that of the inflow side passage.
3. The flow rate adjusting device according to . Claim 1, the input port (154; 158) whose internal passage is the inflow side passage and the output port (156; 157) whose internal passage is the engine side passage extend along each other. The flow rate adjusting device according to any one of claims 2 and 4. The flow rate adjusting device according to claim 6, wherein the engine-side passage is bent outside the housing and extends along the inflow-side passage.

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