JP7273687B2 - non-return valve - Google Patents

Description

The present invention relates to a check valve and a purge solenoid valve provided with the check valve.

In the automotive industry, the downsizing turbo of the engine is progressing against the background of the improvement of fuel efficiency. In a turbo engine car, the vaporized gasoline accumulated in the canister is returned to the engine by the negative pressure generated in the intake manifold (hereinafter referred to as the "intake manifold") when the vehicle is stopped, and is reburned. It is disposed of by returning it to the engine and re-burning it. The pipes of the canister are branched in the middle, one pipe is connected to the intake manifold, and the other pipe is connected upstream of the compressor. In this piping structure, each branched piping must be provided with a check valve in order to prevent reverse flow from the intake manifold and upstream of the compressor to the canister. One type of check valve is an umbrella-type check valve having an umbrella-shaped valve body (see, for example, Patent Document 1).

In recent years, it has become an issue to improve the evaporative gasoline processing capacity of downsized turbo vehicles, and there is a need to return a large amount of evaporative gasoline from the canister to the engine with the slight negative pressure generated by the airflow upstream of the compressor during driving. there is Therefore, the check valve is required to achieve both a large flow rate by opening a large opening even with a very small negative pressure and check sealing performance against the high supercharging pressure that occurs when the engine rotates at high speed.

JP 2019-32056 A

In order to improve the check sealing performance of an umbrella type check valve, it is necessary to increase the rigidity of the valve body. In order to allow a large amount of flow to flow through an umbrella-type check valve, it is necessary to lower the rigidity of the valve body. As described above, the umbrella type check valve has a problem in that it is difficult to achieve both a large flow rate and check sealing performance.

SUMMARY OF THE INVENTION An object of the present invention is to provide a check valve that achieves a large flow rate while maintaining check sealing properties.

A check valve according to the present invention includes a valve body portion having a circular head portion and a shaft portion provided at the center of the head portion, a seal portion in contact with the peripheral edge of the head portion, and a fluid flowing inside the seal portion. A check valve comprising a flow hole and a valve seat portion having a holding portion that holds a shaft portion at the center of the seal portion, wherein the umbrella portion is provided around the shaft portion on a surface facing the flow hole The valve seat portion has a plurality of ribs radially extending from the holding portion provided in the flow hole, and the head portion extends from the plurality of ribs. It has a protruding portion that abuts .

According to this invention, since the head portion is made to open wide by providing the annular groove and lowering the rigidity of the root of the head portion, the non-return valve realizes a large flow rate while maintaining the non-return sealability. A valve can be provided.

1 is a diagram showing a configuration example of a transpired gasoline processing system according to Embodiment 1; FIG. FIG. 2 is a cross-sectional view showing a configuration example of the check valve according to Embodiment 1, showing a valve open state; FIG. 2 is a cross-sectional view showing a configuration example of the check valve according to Embodiment 1, showing a closed state; FIG. 4 is a diagram illustrating the thickness of the check valve according to Embodiment 1; FIG. 3 is a cross-sectional view showing a configuration example of the check valve according to Embodiment 1; 4 is a view in the direction of arrow C showing a configuration example of the check valve according to Embodiment 1. FIG. FIG. 5 is a cross-sectional view showing a modification of the purge solenoid valve according to Embodiment 1;

Embodiment 1.
FIG. 1 is a diagram showing a configuration example of a transpired gasoline processing system according to Embodiment 1. FIG. A transpired gasoline processing system in a turbo engine vehicle includes a fuel tank 1, a canister 2, a purge solenoid valve 3, check valves 4a, 4b, an air cleaner 5, a compressor 6, a throttle valve 7, and an engine 8. In this turbo engine vehicle, air is led out from the air cleaner 5 to the engine 8 . When the compressor 6 is operating, the air from the air cleaner 5 is compressed by the compressor 6 and discharged to the engine 8 .

Evaporated gasoline in the fuel tank 1 accumulates in the canister 2. - 特許庁Evaporated gasoline accumulated in the canister 2 causes negative pressure generated in the intake manifold downstream of the throttle valve 7 when the engine 8 is idling and at low speed, and negative pressure generated upstream of the compressor 6 when the engine 8 is at medium speed and high speed. It is sucked by pressure and combusted in the engine 8 . A purge solenoid valve 3 installed in a pipe downstream of the canister 2 is a valve that controls the amount of evaporated gasoline accumulated in the canister 2 sent to the engine 8 . A check valve 4a for preventing reverse flow from the intake manifold to the canister 2 is installed in a pipe connecting the purge solenoid valve 3 and the intake manifold. A check valve 4 b that prevents reverse flow from the upstream of the compressor 6 to the canister 2 is installed in the piping that connects the purge solenoid valve 3 and the upstream of the compressor 6 .

In Embodiment 1, the check valve 4a and the check valve 4b have the same structure, so that the check valve 4a and the check valve 4b are referred to as the "check valve 4" when there is no need to distinguish between them.

2A and 2B are cross-sectional views showing configuration examples of the check valve 4 according to the first embodiment. 2A shows the open state of the check valve 4, and FIG. 2B shows the closed state of the check valve 4. FIG. The check valve 4 includes a valve body portion 40 and a valve seat portion 43 . The valve body portion 40 is made of an elastic material such as rubber. The valve body portion 40 includes a circular head portion 41 and a shaft portion 42 provided at the center of the head portion 41 . The valve seat portion 43 is made of a rigid body such as metal or resin. The valve seat portion 43 includes a seal portion 44 with which the peripheral edge of the umbrella portion 41 contacts, a flow hole 45 through which fluid flows inside the seal portion 44, and a holding portion 46 that holds the shaft portion 42 at the center of the seal portion 44. Prepare. In the illustrated example, both end portions of the shaft portion 42 are thick and the center portion is thin, and when the center portion is passed through the hole of the holding portion 46, both end portions function as stoppers from the hole.

In the plane of Figures 2A and 2B, there is an intake manifold or compressor 6 upstream and a purge solenoid valve 3 below. Further, the surface of the umbrella portion 41 on the upper side of the paper surface is called "front surface", and the surface of the umbrella portion 41 on the lower side of the paper surface, that is, the surface facing the flow hole 45 is called the "back surface". When a negative pressure is applied to the front surface of the head portion 41 or a positive pressure is applied to the back surface of the head portion 41, the head portion 41 warps and its peripheral edge opens apart from the seal portion 44, and passes through the flow hole 45 to the figure. Evaporated gasoline flows in the direction of the arrow indicated by 2A. Conversely, when a positive pressure is applied to the front surface of the head portion 41 or a negative pressure is applied to the back surface of the head portion 41, the peripheral edge of the head portion 41 contacts the seal portion 44 of the valve seat portion 43, whereby the head portion 41 is closed. blocks the flow hole 45 and prevents back flow in the direction of the arrow shown in FIG. 2B.

FIG. 3 is a diagram illustrating the thickness of the check valve 4 according to Embodiment 1. FIG. FIG. 4A is a cross-sectional view showing a configuration example of the check valve 4 according to Embodiment 1. FIG. 4B is a view in the direction of arrow C showing a configuration example of the check valve 4 according to Embodiment 1. FIG. In order to increase the flow rate of the check valve 4, an annular groove 41a is provided around the shaft portion 42 on the rear surface of the umbrella portion 41 facing the flow hole 45. As shown in FIG. The thickness A1 of the portion where the annular groove 41a is provided is thinner than the thicknesses A2 and A3 on the peripheral edge side of the annular groove 41a. Therefore, the rigidity of only the portion of the annular groove 41a of the umbrella portion 41 is reduced. As a result, the head portion 41 is easily deformed by the annular groove 41a, and the amount of warping of the head portion 41 becomes greater than when there is no annular groove 41a. As a result, the peripheral edge of the umbrella portion 41 opens wide, and the flow rate of the check valve 4 can be increased. In addition, since the thickness of the peripheral edge side of the annular groove 41a of the head portion 41 is not changed, the rigidity of the peripheral edge side does not decrease, and the non-return sealability is maintained.

Moreover, the head portion 41 has a structure in which the pressure receiving area B1 is large during forward flow and the pressure receiving area B2 is small during reverse flow. The pressure-receiving area B<b>1 during forward flow is the area of the entire head portion 41 . The pressure-receiving area B<b>2 at the time of backflow is the area of the portion of the head portion 41 excluding the peripheral edge that contacts the seal portion 44 . Since the receiving pressure acting on the head portion 41 increases due to the large pressure receiving area B1 during the forward flow, the head portion 41 opens even at low pressure. That is, the valve opening responsiveness of the check valve 4 is improved. Since the pressure-receiving area B2 at the time of reverse flow is small, it is possible to prevent sealing defects due to excessive deformation of the head portion 41 under high pressure when the valve is closed. That is, the non-return sealability of the check valve 4 is improved. A sealing failure due to excessive deformation of the head portion 41 under high pressure refers to, for example, a state in which a gap is generated between the peripheral edge of the head portion 41 and the seal portion 44 due to the head portion 41 dropping into the flow hole 45 . .

Moreover, in order to suppress excessive deformation of the portion of the umbrella portion 41 facing the through hole 45, a projection portion 41b is provided at that portion. The protrusion 41b is, for example, an annular protrusion provided outside the annular groove 41a, as shown in FIG. 4B. In addition, a plurality of ribs 45a are provided in the communication hole 45 of the valve seat portion 43 and radially extend from the holding portion 46 in the radial direction. For example, as shown in FIG. 4B, eight ribs 45a are provided at intervals of 45 degrees in the circumferential direction. The protrusion 41b abuts against the rib 45a, thereby suppressing excessive deformation of the umbrella portion 41 that receives high pressure during reverse flow. As a result, sealing failure due to the umbrella portion 41 dropping into the flow hole 45 during reverse flow is prevented.

Furthermore, in order to suppress deformation of the peripheral edge of the head portion 41, the head portion 41 has a shape in which the thickness A3 of the portion facing the seal portion 44 is thicker than the thickness A2 of the portion facing the flow hole 45. be. Since the thickness A3 of the peripheral edge of the head portion 41 is large, the rigidity is increased, and the deformation is less likely to occur during reverse flow. Therefore, when backflow occurs, the contact area between the peripheral edge of the umbrella portion 41 and the seal portion 44 increases, and sealing failure of the umbrella portion 41 is suppressed.

As described above, the check valve 4 according to Embodiment 1 includes the valve body portion 40 and the valve seat portion 43 . The valve body portion 40 has a circular head portion 41 and a shaft portion 42 provided at the center of the head portion 41 . The valve seat portion 43 includes a seal portion 44 with which the peripheral edge of the umbrella portion 41 contacts, a communication hole 45 through which fluid flows inside the seal portion 44, and a holding portion 46 that holds the shaft portion 42 at the center of the seal portion 44. have. The head portion 41 has an annular groove 41 a provided around the shaft portion 42 on the surface facing the flow hole 45 . With this configuration, the head portion 41 is deformed on the root side and the peripheral edge opens wide, so that a large flow rate can be realized while maintaining the check seal performance of the check valve 4 . When this check valve 4 is used as the check valves 4a and 4b of a vaporized gasoline processing system, the check valves 4a and 4b can be opened to return a large amount of vaporized gasoline to the engine 8 even under a slight negative pressure. In addition, high supercharging pressure can be prevented from flowing back to the purge solenoid valve 3 and the canister 2.

Further, according to the first embodiment, the valve seat portion 43 has a plurality of ribs 45 a radially extending around the holding portion 46 provided in the flow hole 45 . The umbrella portion 41 has protrusions 41b that come into contact with the plurality of ribs 45a. With this configuration, it is possible to prevent a sealing failure due to the umbrella portion 41 dropping into the flow hole 45 when the water flows backward.

Further, according to Embodiment 1, the thickness A3 of the portion facing the sealing portion 44 is thicker than the thickness A2 of the portion facing the circulation hole 45 of the umbrella portion 41 . With this configuration, it is possible to suppress the deformation of the peripheral edge of the head portion 41 during reverse flow, thereby preventing defective seals.

In FIGS. 1 to 4B, the purge solenoid valve 3 and the check valves 4a and 4b are configured independently. good. FIG. 5 is a cross-sectional view showing a modification of the purge solenoid valve 3 according to Embodiment 1, showing a closed state. The purge solenoid valve 3 has an introduction port 30 for introducing the evaporated gasoline from the canister 2, a first outlet port 31a for leading the evaporated gasoline to the intake manifold, and a second outlet port 31b for leading the evaporated gasoline upstream of the compressor 6. , a branch channel 32 branching from the introduction port 30 into a first outlet port 31a and a second outlet port 31b.

A valve body portion 33 and a valve seat portion 37 for opening and closing the flow path are provided upstream of the branch flow path 32 in the flow path connecting the introduction port 30 and the branch flow path 32 . When the valve body portion 33 is separated from the valve seat portion 37 to open the valve, the introduction port 30 is connected to the check valve 4a and the check valve 4b. When the valve body portion 33 comes into contact with the valve seat portion 37 to close the valve, the introduction port 30 and the check valves 4a and 4b are blocked.

The valve body portion 33 is opened and closed by a solenoid portion 34 and a spring 35 . The solenoid portion 34 has a coil 34a, a core 34b excited by energizing the coil 34a, a pin 34c projecting from the core 34b to the valve body portion 33, and a plunger 34d attracted to the core 34b. The valve body portion 33 is fixed to the plunger 34d. When the coil 34a is energized through the power supply terminal 36, the plunger 34d is attracted to the core 34b until the valve body 33 contacts the pin 34c, and the valve body 33 is separated from the valve seat 37. When the energization of the coil 34 a stops, the valve body portion 33 that receives the biasing force of the spring 35 contacts the valve seat portion 37 .

A check valve 4a is installed in the flow path connecting the branch flow path 32 and the first outlet port 31a. The check valve 4a closes when the pressure on the side of the introduction port 30 communicating with the canister 2 becomes higher than the pressure on the side of the first outlet port 31a communicating with the intake manifold.

A check valve 4b is installed in the flow path connecting the branch flow path 32 and the second lead-out port 31b. The check valve 4b closes when the pressure on the side of the second outlet port 31b communicating with the upstream side of the compressor 6 becomes higher than the pressure on the side of the introduction port 30 communicating with the canister 2 .

It should be noted that, within the scope of the invention, any component of the embodiment can be modified, or any component of the embodiment can be omitted.

1 fuel tank, 2 canister, 3 purge solenoid valve, 4, 4a, 4b check valve, 5 air cleaner, 6 compressor, 7 throttle valve, 8 engine, 30 inlet port, 31a first outlet port, 31b second outlet port, 32 branch flow path, 33 valve body portion, 34 solenoid portion, 34a coil, 34b core, 34c pin, 34d plunger, 35 spring, 36 power supply terminal, 37 valve seat portion, 40 valve body portion, 41 head portion, 41a annular ring Groove 41b Projection 42 Shaft 43 Valve seat 44 Seal 45 Flow hole 45a Rib 46 Holding portion A1, A2, A3 Thickness B1, B2 Pressure receiving area.

Claims (1)

a valve body portion having a circular head portion and a shaft portion provided at the center of the head portion;
A check valve comprising a seal portion with which the peripheral edge of the head portion contacts, a flow hole through which fluid flows inside the seal portion, and a valve seat portion having a holding portion that holds the shaft portion at the center of the seal portion. There is
The head portion has an annular groove provided around the shaft portion on a surface facing the flow hole,
The valve seat portion has a plurality of ribs provided in the flow hole and radially extending in a radial direction around the holding portion,
The check valve , wherein the head portion has projections that contact the plurality of ribs .

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