JP2018168925A - Reed valve - Google Patents

Abstract

Provided is a reed valve excellent in durability without changing the properties of a reed-shaped valve body. A reed valve comprising a main body (24) provided with a valve hole (30) through which a fluid flows and a lead-shaped valve body (23) for opening and closing the valve hole. And a beam part (24c) forming a part of the valve seat part (28) is provided in the main body. [Selection] Figure 2

Description

  The present invention relates to a reed valve that controls the inflow of air using a reed-shaped valve body, and more particularly to a technique for improving the durability of the reed valve.

The reed valve is composed of a valve body having a valve hole and a lead-shaped valve body, and the valve body contacts the valve seat around the valve hole of the valve body according to the fluid pressure acting on the valve body through the valve hole. It is a type of check valve that closes in contact or opens away from the valve seat.
Such a reed valve is required to have a sealing performance when the valve is closed, and the valve main body is configured such that, for example, a rubber-like elastic member is baked on a valve seat portion made of a metal material such as aluminum.

  In particular, a reed valve used in an intake system or an exhaust system of an internal combustion engine is required to have heat resistance and durability at high temperatures. For example, a heat-resistant resin layer is provided on the valve seat portion of the valve body. A reed valve formed and using a flexible stainless steel plate as a valve body has been proposed (Patent Document 1).

JP 2007-333106 A

  By the way, in a reed valve used for an intake system and an exhaust system of an internal combustion engine, since the pressure change of the intake pressure and exhaust pressure acting on the valve hole is severe, the valve body is required to have high strength. In particular, in the case of a reed valve used in an exhaust system of an internal combustion engine, high-pressure exhaust may temporarily act on the valve body, causing the reed valve to suddenly operate toward the valve closing side. There is a problem in that the durability of the valve body is adversely affected by being strongly pressed against the valve seat portion of the valve body.

  As a method for increasing the strength of the valve body, it is conceivable to change the properties of the valve body by changing the material or increasing the plate pressure. However, in general, a material that achieves both flexibility and high strength is expensive and impractical, and increasing the plate pressure is not preferable because flexibility decreases.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a reed valve having excellent durability without changing the properties of the reed-shaped valve body.

In order to achieve the above object, a reed valve according to the present invention includes a main body provided with a valve hole through which a fluid flows, and a reed that opens and closes the valve hole, one end of which is attached to the main body and the other end is a free end. The main body has a beam portion that extends through the valve hole and forms a part of a valve seat portion with which the valve body abuts.
As a result, for example, even when the reed valve is suddenly actuated to the valve closing side and the valve element is strongly pressed against the valve seat, the valve element is received by the beam and acts on the valve element. Stress to be reduced.

Preferably, the beam portion receives a central portion of a region range of the valve body that covers the valve hole.
In this way, by configuring the beam part to receive the central part of the range of the valve body that covers the valve hole, that is, the part where the greatest stress acts on the valve body, the stress acting on the valve body is reduced well. Is done.

Further, the beam portion is disposed so that a circulation amount of the fluid flowing through the valve element on the free end side of the valve hole is larger than a circulation amount of the fluid flowing through the one end side portion. Is preferred.
As a result, when the reed valve is opened, the valve body can be flexed with high responsiveness, and when the reed valve is closed, the stress acting on the valve body can be reduced to prevent deformation of the valve body.

  According to the reed valve of the present invention, since the beam hole forming a part of the valve seat portion is provided in the valve hole, even when the valve body is strongly pressed against the valve seat portion, The stress acting on the valve body can be reduced to prevent the deformation of the valve body, and a reed valve having excellent durability can be realized without changing the properties of the lead-shaped valve body.

  In particular, the beam part is configured to receive the central part of the area of the valve body that covers the valve hole, that is, the part where the largest stress acts on the valve body, so that the stress acting on the valve body is good. And the deformation of the valve body can be effectively prevented.

It is a schematic diagram which shows the outline | summary of the secondary air system of the internal combustion engine in which the reed valve of this invention is used. It is a sectional side view of the reed valve concerning a 1st embodiment. It is a top view of the reed valve concerning a 1st embodiment. It is a disassembled perspective view of the reed valve concerning a 1st embodiment. It is a top view of the valve body concerning a 1st embodiment. It is a figure which compares and shows the measurement result of the stress distribution which acts on a valve body with the reed valve (solid line) which concerns on this invention, and the conventional reed valve (one-dot chain line). It is a top view of the valve body concerning a modification of a 1st embodiment. It is a top view of the valve body concerning a 2nd embodiment. It is a top view of the valve body concerning the modification of a 2nd embodiment. It is a top view of the valve body concerning a 3rd embodiment. It is a top view of the valve body concerning a modification of a 3rd embodiment. It is a top view of the valve body concerning other modifications of a 3rd embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[First Embodiment]
First, a first embodiment of the present invention will be described.
FIG. 1 is a schematic diagram showing an outline of a secondary air system of an internal combustion engine in which the reed valve of the present invention is used. In this embodiment, the secondary air system will be described as an example. However, the place where the reed valve according to the present invention is used is not limited to the secondary air system.

  An intake pipe 12 is attached to an intake port 11 of a cylinder head 10 of the internal combustion engine, and outside air is guided into the cylinder through an air cleaner 13. An exhaust pipe 15 is attached to the exhaust port 14, and the exhaust pipe 15 is connected to an exhaust muffler (not shown).

  The exhaust port 14 is provided with a secondary air supply path 16 that communicates secondary air to an exhaust system including the exhaust port 14 and the exhaust pipe 15. Secondary air is supplied to the secondary air supply path 16 via an air cleaner 17, an air cut valve 18, and a reed valve unit 19. The air cut valve 18 includes a diaphragm chamber communicated with the intake pipe 12 via the vacuum pipe 12a, and is configured such that when a negative pressure is generated in the exhaust port 14, the diaphragm 18a is activated and the control valve 18b of the air cut valve 18 is opened. Has been.

  The reed valve unit 19 provided between the air cut valve 18 and the secondary air supply path 16 has a reed valve 20 in the housing, and the reed valve 20 is connected to the secondary air supply path from the air cut valve 18. It functions as a check valve that allows air (fluid) to flow toward 16. That is, the reed valve 20 opens only when negative pressure is generated in the exhaust port 14, applies negative pressure to the air cut valve 18, opens the control valve 18 b, and supplies secondary air to the exhaust port 14. .

  2 is a side sectional view of the reed valve 20 according to the first embodiment of the present invention, FIG. 3 is a plan view thereof, and FIG. 4 is an exploded perspective view thereof. In FIG. 1, since the air cut valve 18 is located on the upper side and the secondary air supply path 16 is located on the lower side, the reed valve 20 is also shown to supply secondary air from the upper side to the lower side. However, in FIGS. 2 and 4, the reed valve 20 is shown inverted so that air flows from the lower side to the upper side.

  The reed valve 20 is mainly composed of a lead-shaped valve body 23 and a valve body 24 to which the valve body 23 is attached. The valve body 23 is configured by a thin plate made of, for example, a flat stainless plate having flexibility. The valve main body 24 is formed by laminating a heat-resistant resin member 26 such as a fluororesin on a thick plate-like member 25 made of a rigid body such as aluminum, an aluminum alloy, or other metal formed by die casting, for example. A hole 30 is provided. Specifically, here, the valve hole 30 has two valve holes 30a and 30b.

  The valve body 23 has a sufficient size to cover the valve holes 30a and 30b, and is placed on the valve body 24 so as to cover and close the valve holes 30a and 30b. And the end part (one end) 23a of the valve body 23 is being fixed to the valve attachment surface 24a which is one surface of the valve main body 24 by the fixing means so that the valve hole 30 can be opened and closed. In the present embodiment, a screw hole 24 b that is screwed into the screw 29 is formed in the valve mounting surface 24 a of the valve body 24, and a through hole of the screw 29 is provided in the valve body 23. It is fixed to the valve body 24.

  The valve body 24 is provided with a beam portion 24c positioned so as to separate the valve hole 30a and the valve hole 30b from each other in the direction in which the valve body 23 extends. That is, the beam portion 24 c is provided so as to extend across the valve hole 30. Referring to FIG. 5, a plan view of the valve main body 24 is shown. Here, the beam portion 24c is provided so that, for example, the valve hole 30a and the valve hole 30b have the same opening area. The beam portion 24 c is a part of the valve body 24, and a heat-resistant resin member 26 such as a fluororesin is baked in layers on a thick plate-like member 25, like the other parts of the valve body 24, and is integrated with the valve body 24. Is provided.

  Accordingly, the surface of the beam portion 24c that is covered by the valve body 23 is a flat surface that is smoothly and continuously uniform with the peripheral surfaces of the valve holes 30a and 30b that are covered by the valve body 23 in the valve mounting surface 24a. And the valve seat portion 28 with which the valve element 23 abuts together with the peripheral surfaces of the valve holes 30a and 30b.

In this way, the valve seat portion 28 is configured, and the valve body 23 is fixed to the valve body 24 with the screw 29, so that the surface of the valve body 23 on the valve body 24 side normally contacts the valve seat portion 28. The reed valve 20 is closed.
When the air pressure above the valve body 23 in FIG. 2 (on the exhaust port 14 side in FIG. 1) is higher than below (on the air cut valve 18 side in FIG. 1), the valve body 23 is pressed against the valve seat 28. Accordingly, the reed valve 20 is held in a closed state, and air flow through the valve holes 30a and 30b is blocked.

  On the other hand, when the air pressure above the valve body 23 in FIG. 2 (on the side of the exhaust port 14 in FIG. 1) is lower than below (on the side of the air cut valve 18 in FIG. 1), that is, in FIG. When a negative pressure is generated in the exhaust system consisting of the above, the negative pressure acts on the valve body 23. At this time, since the valve body 23 is cantilevered at the end 23a, the free end (other end) 23b side of the valve body 23 is pulled away from the valve seat 28, as shown in FIG. Bend upward. Thereby, the reed valve 20 is opened, and when the air cut valve 18 is opened, air flows from the lower side (the air cut valve 18 side in FIG. 1) to the upper side (the exhaust port 14 side in FIG. 1).

The valve body 24 is provided with a stopper 32 that restricts the deflection of the valve body 23 to a certain range. The stopper 32 is made of, for example, a curved plate member. One end 32a of the valve body 23 is fixed to the valve main body 24 by a screw 29 together with the valve body 23, and the other end 32b is curved so as to be positioned at a predetermined distance from the valve mounting surface 24a. Has been. The stopper 32 has sufficient rigidity to restrict the deflection of the valve body 23.
Thus, when the deflection of the valve body 23 increases, the free end 23b of the valve body 23 comes into contact with the other end 32b of the stopper 32, and the deflection of the valve body 23 is restricted.

As described above, in the reed valve according to the present invention, the beam portion 24c is provided in the valve body 24 so as to separate the valve hole 30a and the valve hole 30b, and the beam portion 24c is provided with the valve hole 30a, The valve seat portion 28 is configured to have a uniform plane together with the peripheral surface of 30b.
Therefore, the reed valve according to the present invention can receive the valve element 23 not only at the peripheral portions of the valve holes 30a and 30b but also at the beam portion 24c when the valve is closed.

  If the beam portion 24c is not provided, the pressure receiving area of the valve body 23 in one valve hole is widened. Therefore, the air pressure above the valve body 23 in FIG. 2 (exhaust port 14 side in FIG. 1) is sharply higher than below (the air cut valve 18 side in FIG. 1), and the valve body 23 is the valve seat 28. If it is strongly pressed against, the central part of the valve body 23 is easily deformed so as to swell toward the valve hole by the strong pressing force. However, if the valve body 23 can also be received by the beam portion 24c as described above, even if the valve body 23 is strongly pressed against the valve seat portion 28, the valve body 23 is reliably received by the beam portion 24c, The deformation of the valve body 23 is prevented.

  In particular, the beam portion 24c is provided so that, for example, the valve hole 30a and the valve hole 30b have the same opening area, so that the central portion of the region of the valve body 23 that covers the valve hole 30, that is, It is possible to catch the portion of the valve body 23 on which the greatest stress acts, and the deformation of the valve body 23 is satisfactorily prevented.

  Referring to FIG. 6, the measurement result of the stress distribution acting on the valve body when the valve body is pushed to the valve hole side with the same air pressure shows the reed valve 20 (solid line) according to the present invention having the beam portion 24 c and the beam. It is shown in comparison with a conventional reed valve (one-dot chain line) having no part. In this figure, the horizontal axis is the distance from the end of the valve hole (0%) where the valve body is fixed to the end of the valve hole (100%) through the central part (50%) of the valve hole. The position, that is, each position in the region range where the valve body covers the valve hole is shown as a percentage, and the vertical axis shows the stress acting on the valve body. In FIG. 6, the valve hole 30a, the valve hole 30b, and the beam portion 24c of the reed valve 20 according to the present invention are shown corresponding to the horizontal axis.

As shown in the figure, in the reed valve 20 (solid line) according to the present invention having the beam portion 24c, the stress acting on the valve body is reduced to about 1/3 as compared with the conventional reed valve (one-dot chain line). It turns out that it is suppressed to.
Thus, in the reed valve 20 according to the present invention having the beam portion 24 c, even if the valve body 23 is strongly pressed against the valve seat 28, the center of the region of the valve body 23 that covers the valve hole 30. Since the portion, that is, the portion where the largest stress of the valve body 23 acts is received by the beam portion 24c, the stress acting on the valve body 23 as a whole can be reduced, and the deformation of the valve body 23 can be prevented.

Further, as a modification of the first embodiment, a valve body 124 as shown in a plan view in FIG. 7 may be used. The valve body 124 has valve holes 130a to 130c as the valve holes 130, and has two beam portions 124c so as to separate the valve holes 130a to 130c in the direction in which the valve body 23 extends. .
According to the valve main body 124, the central portion of the region of the valve body 23 covering the valve hole 130, that is, the vicinity of the portion where the largest stress acts on the valve body 23 can be received by the two beam portions 124c. As a whole, the stress acting on the valve body 23 can be reduced, and the same effect as described above can be obtained.

[Second Embodiment]
Referring to FIG. 8, a plan view of the valve body 224 of the reed valve according to the second embodiment of the present invention is shown.
The second embodiment is different from the first embodiment in that the beam portion is provided in the direction in which the valve element 23 extends. The description of the parts common to the first embodiment is omitted, and only the different parts are described. To do.

As shown in FIG. 8, the valve body 224 has a valve hole 230a and a valve hole 230b as the valve hole 230. The valve hole 230a and the valve hole 230b are arranged in the same direction as the direction in which the valve body 23 extends. The beam portions 224c extending inward are separated from each other.
Even when the beam portion 224c is provided in this way, as in the case of the first embodiment, the central portion of the region of the valve body 23 covering the valve hole 230, that is, the largest stress of the valve body 23 acts. It can be received by the beam portion 224c including the portion, the stress acting on the valve body 23 can be reduced well, and the deformation of the valve body 23 can be prevented.

Further, as a modification of the second embodiment, a valve body 324 as shown in a plan view in FIG. 9 may be used. The valve body 324 has valve holes 330a to 330d as valve holes 330, and a cross-shaped beam portion 324c so as to separate the valve holes 330a to 330d.
Thereby, the central part of the area | region range which covers the valve hole 330 among the valve bodies 23, ie, the part to which the largest stress of the valve body 23 acts can be received by the cross-shaped beam part 324c, and the valve body as a whole 23 can be reduced more favorably, and the same effect as described above can be obtained.

[Third Embodiment]
Referring to FIG. 10, a plan view of a valve body 424 of a reed valve according to a third embodiment of the present invention is shown.
The third embodiment is different from the first and second embodiments in that a beam portion 424c that suppresses the influence on the air flow on the free end 23b side of the valve body 23 is different from the first embodiment and the second embodiment. A different part from embodiment and 2nd Embodiment is demonstrated.

  As shown in FIG. 10, in the third embodiment, the valve hole 430 has a valve hole 430a and a valve hole 430b, and the valve hole 430a and the valve hole 430b are aligned in the direction in which the valve body 23 extends. Are separated by each other. That is, the beam portion 424 c is provided so as to extend across the valve hole 230. Here, the beam portion 424c has a T-shape and has a protruding portion 424d, and the opening area of the valve hole 430b on the free end 23b side of the valve body 23 is made wider than the valve hole 430a on the end portion 23a side. The beam portion 424c is configured so that the protruding portion 424d receives the central portion of the region of the valve body 23 that covers the valve hole 430, that is, the portion of the valve body 23 where the greatest stress acts.

  By providing the beam portion 424c having such a protrusion 424d, the valve hole 430 of the valve body 23 is covered while increasing the amount of air flowing through the valve hole 430b on the free end 23b side of the valve body 23. It is possible to receive a central portion of the region range, that is, a portion where the greatest stress of the valve body 23 acts. That is, the valve element 23 can be flexed with high responsiveness when the valve is opened, and deformation of the valve element 23 can be prevented by reducing the stress acting on the valve element 23 when the valve is closed.

Further, as a modification of the third embodiment, a valve body 524 as shown in a plan view in FIG. 11 may be used. The valve body 524 has a valve hole 530a and a valve hole 530b as the valve hole 530, and a V-shaped beam portion 524c extending from the end 23a side of the valve body 23 so as to separate the valve hole 530a and the valve hole 530b. have.
By providing such a V-shaped beam portion 524c, a region covering the valve hole 530 in the valve body 23 while also increasing the amount of air flowing through the valve hole 530b on the free end 23b side of the valve body 23. The center part of the range, that is, the part where the greatest stress acts on the valve body 23 can be received, and the same effect as described above can be obtained.

Moreover, you may use the valve main body 624 which shows a top view in FIG. 12 as another modification of 3rd Embodiment. The valve main body 624 has a valve hole 630, and has an I-shaped beam portion 624 c that extends in the same direction as the direction in which the valve body 23 extends from the end 23 a side of the valve body 23 in the valve hole 630.
Providing such an I-shaped beam 624c increases the amount of air flowing through the portion of the valve hole 630 on the free end 23b side of the valve body 23 without separating the valve hole 630 by the beam. On the other hand, the central portion of the region of the valve body 23 covering the valve hole 630, that is, the portion where the largest stress acts on the valve body 23 can be received, and the same effect as described above can be obtained.

  As described above, as described in the first to third embodiments, according to the reed valve according to the present invention, the beam portion forming a part of the valve seat portion is provided so as to extend in the valve hole. Even when the valve body is strongly pressed against the valve seat, the stress acting on the valve body can be reduced to prevent deformation of the valve body, without changing the properties of the lead-shaped valve body, A reed valve with excellent durability can be realized.

  In particular, the beam part is configured to receive the central part of the area of the valve body that covers the valve hole, that is, the part where the largest stress acts on the valve body, so that the stress acting on the valve body is good. And the deformation of the valve body can be effectively prevented. At this time, by configuring the beam portion so that the influence on the flow rate of the air flowing through the free end portion of the lead-shaped valve body in the valve hole is suppressed, the valve body is opened when the reed valve is opened. While being able to bend with sufficient responsiveness, the stress which acts on a valve body at the time of valve closing can be reduced, and a deformation | transformation of a valve body can be prevented. Thus, a reed valve excellent in functionality and durability can be realized.

The description of the embodiment is finished as above, but the aspect of the present invention is not limited to the above embodiment.
For example, in the above embodiment, the reed valve 20 having only one lead-shaped valve body has been described as an example. However, the present invention is applied to a multiple-type reed valve having a plurality of lead-shaped valve bodies in parallel. You may make it do.
In the above-described embodiment, the valve main body 24 having a structure in which the heat-resistant resin member 26 is baked in a layered manner on the thick plate-like member 25 made of a rigid body such as metal has been described as an example. It is not something that can be done.

14 Exhaust port 15 Exhaust pipe 16 Secondary air supply path 19 Reed valve unit 20 Reed valve 23 Valve body 24 Valve body 24c Beam part 28 Valve seat part 30 Valve hole 124 224, 324, 424, 524, 624 Valve body 124c, 224c, 324c, 424c, 524c, 624c Beam portion 130, 230, 330, 430, 530, 630 Valve hole 424d Protruding portion (beam portion)

Claims (3)

A body provided with a valve hole through which fluid flows;
One end is attached to the main body, the other end is a free end, and comprises a lead-shaped valve body that opens and closes the valve hole,
The reed valve, wherein the main body includes a beam portion that extends through the valve hole and forms a part of a valve seat portion with which the valve body abuts.   The reed valve according to claim 1, wherein the beam portion receives a central portion of a region range of the valve body that covers the valve hole.   The said beam part is arrange | positioned so that the distribution | circulation amount of the fluid which flows through the said free end side part of the said valve body among the said valve holes may become larger than the distribution | circulation amount of the fluid which flows through the said one end side part. 2. The reed valve according to 2.

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