JP7664822B2 - Double Eccentric Valve - Google Patents

Description

The technology disclosed in this specification relates to a double eccentric valve in which the axis of the rotation shaft, which is the center of rotation of the valve body, is positioned away from the sealing surface of the valve body and away from the axis of the valve body.

Conventionally, as this type of technology, for example, the "double eccentric valve" described in the following Patent Document 1 is known. This double eccentric valve includes a valve seat having a valve hole, a valve body with a sealing surface formed on the outer periphery and provided corresponding to the valve seat, a sealing member provided on the valve seat and formed of an elastic material for sealing between the valve body and the valve seat when the valve body is seated on the valve seat and fully closed, a rotating shaft for rotating the valve body, a drive mechanism for rotating the rotating shaft, and a bearing for rotatably supporting the rotating shaft. In this double eccentric valve, the axis of the rotating shaft, which is the center of rotation of the valve body, is positioned away from the sealing surface of the valve body and is also positioned away from the axis of the valve body. Here, the sealing member is positioned along the inner periphery of the valve hole of the valve seat and can be fixed by bonding with an adhesive.

JP 2018-66386 A

The double eccentric valve described in Patent Document 1 is sometimes used as an air valve to adjust the flow rate of air, etc., in a fuel cell system. In this case, if air, etc. flows between the valve body and the sealing member when the double eccentric valve is open, the flow may act on the sealing member or adhesive, reducing the adhesive strength of the adhesive or causing the adhesive to flow out. In addition, when the valve is open, the valve body slides on the sealing member, and this sliding stress acts on the sealing member. As a result, there is a risk that the sealing member will be pulled off the valve seat and fall off.

This disclosed technology was made in consideration of the above circumstances, and its purpose is to prevent the falling off of the seal member from the valve seat due to the sliding of the valve body or the flow of fluid when the valve is opened in a double eccentric valve in which a seal member is provided in the valve hole of the valve seat.

In order to achieve the above object, the technology described in claim 1 provides a valve device comprising: a housing including a flow path through which a fluid flows; a valve seat provided in the flow path and having a valve hole; a valve disc having a seal surface formed on its outer periphery and provided corresponding to the valve seat; a seal member made of an elastic material provided on the valve seat and interposed between the valve disc and the valve seat when the valve disc is seated on the valve seat to seal between the valve disc and the valve seat; and a rotating shaft for rotating the valve disc, the axis of the rotating shaft being the center of rotation of the valve disc being spaced apart from the seal surface of the valve disc in the direction in which the axis of the valve disc extends and spaced apart from the axis of the valve disc in the radial direction of the valve disc. In the heavy eccentric valve, the sealing member includes a connecting portion that is mechanically connected to the valve seat so as to enclose a portion of the valve seat, the connecting portion is arranged corresponding to at least one location in the circumferential direction of the valve hole, the valve body includes a first side portion and a second side portion bounded by an imaginary plane that extends parallel to the direction in which the axis of the valve body extends from the axis of the rotating shaft, and when the valve body begins to rotate in the opening direction from a fully closed state in which it is seated on the valve seat, the first side portion rotates in a direction away from the valve hole and the second side portion rotates in a direction into the valve hole, and the connecting portion is arranged corresponding to a portion in the circumferential direction of the valve hole where the first side portion of the valve body sits on the valve seat .

According to the configuration of the above technology, when the valve is fully closed, the entire sealing surface of the valve body is evenly in contact with the inner peripheral surface of the seal member, so that the gap between the valve body and the valve seat is suitably sealed by the seal member, and the flow path is blocked. In addition, since the seal member is mechanically connected to the valve seat by the connecting portion, even if stress due to sliding of the valve body or stress due to the flow of fluid acts on the seal member when the valve is open, the seal member is not peeled off from the valve seat. In addition, when the valve body starts to rotate from the fully closed state to the opening direction, the first side portion of the valve body rotates in a direction away from the valve hole, but the connecting portion is disposed in a position corresponding to the position where the first side portion of the valve body sits on the valve seat in the circumferential direction of the valve hole. Therefore, even if the fluid flows through the gap between the first side portion and the seal member after the valve body is opened, and stress due to the flow of the fluid acts on the seal member downstream of the valve seat, the seal member is not peeled off from the valve seat by the connecting portion.

In order to achieve the above object, the technology described in claim 2 provides a double eccentric valve comprising: a housing including a flow path through which a fluid flows; a valve seat provided in the flow path and having a valve hole; a valve disc having a seal surface formed on its outer periphery and provided corresponding to the valve seat; a seal member made of an elastic material provided on the valve seat and interposed between the valve disc and the valve seat when the valve disc is seated on the valve seat and fully closed to seal between the valve disc and the valve seat; and a rotating shaft for rotating the valve disc, wherein the axis of the rotating shaft, which is the center of rotation of the valve disc, is disposed away from the seal surface of the valve disc in the direction in which the axis of the valve disc extends and is disposed away from the axis of the valve disc in the radial direction of the valve disc, The material includes a connecting portion that is mechanically connected to the valve seat so as to enclose a portion of the valve seat, the connecting portion being arranged to correspond to at least one location in the circumferential direction of the valve hole, the valve body includes a first side portion and a second side portion bounded by an imaginary plane extending parallel to the direction in which the axis of the valve body extends from the axis of the rotating shaft, and when the valve body begins to rotate in the opening direction from a fully closed state in which it is seated on the valve seat, the first side portion rotates in a direction away from the valve hole and the second side portion rotates in a direction into the valve hole, and the connecting portion is arranged to correspond to a portion in the circumferential direction of the valve hole where the second side portion of the valve body sits on the valve seat and is furthest from the axis of the rotating shaft or a vicinity thereof .

According to the configuration of the above technology, when the valve is fully closed, the entire sealing surface of the valve body is evenly in contact with the inner peripheral surface of the seal member, so that the gap between the valve body and the valve seat is appropriately sealed by the seal member, and the flow path is blocked. In addition, since the seal member is mechanically connected to the valve seat by the connecting portion, even if stress due to the sliding of the valve body or stress due to the flow of the fluid acts on the seal member when the valve is open, the seal member is not peeled off from the valve seat. In addition, when the valve body starts to rotate from the fully closed state to the valve opening direction, the second side portion of the valve body rotates in the direction into the valve hole, but the connecting portion is disposed in the circumferential direction of the valve hole at the portion where the second side portion sits on the valve seat and is the furthest from the axis of the rotation shaft or its periphery. Therefore, even if stress due to the sliding of the valve body acts on the seal member due to the rotation of the valve body when the valve body is open, the seal member is not peeled off from the valve seat by the connecting portion.

In order to achieve the above object, the technology described in claim 3 is directed to the technology described in claim 1 or 2 , in which the connecting portion is located between a main portion on the radial outside of the valve seat and a sub-portion on the radial inside, and includes an anchor portion that is engageable with the sub-portion .

According to the configuration of the above technology, in addition to the effect of the technology described in claim 1 or 2 , the anchor portion is located between the main portion on the radially outer side of the valve seat and the sub-portion on the radially inner side and is capable of engaging with the sub-portion. Therefore, even if stress due to the sliding of the valve body or stress due to the flow of fluid acts on the sealing member when the valve is opened, the anchor portion engages with the sub-portion of the valve seat, and the sealing member will not be pulled off from the valve seat.

In order to achieve the above object, the technology described in claim 4 is the technology described in claim 3 , wherein the sealing member is arranged along the inner circumference of the valve hole and has a thickness in the radial direction of the valve hole, and when the valve body is fully closed, the sealing surface of the valve body contacts the radially inner side of the thickness, and the anchor portion is positioned radially outward of the thickness .

According to the configuration of the above technology, in addition to the effect of the technology described in claim 3 , when the valve starts to open, the seal surface of the valve disc slides on the radially inner side of the thickness of the seal member, but the anchor portion is disposed on the radially outer side of the thickness of the seal member. Therefore, even if stress is generated due to sliding with the seal surface on the radially inner side of the thickness of the seal member when the valve starts to open, the stress is unlikely to act on the anchor portion disposed on the radially outer side of the thickness.

In order to achieve the above object, the technology described in claim 5 is directed to the technology described in claim 3 or 4 , in which the valve seat has one end and the other end in its axial direction, and the anchor portion is correspondingly positioned within a range from the one end to the other end in the axial direction of the valve seat .

According to the configuration of the above technology, in addition to the effect of the technology described in claim 3 or 4 , the anchor portions are disposed correspondingly within a range from one end to the other end in the axial direction of the valve seat, and the anchor portions have a length sufficient to withstand stress.

In order to achieve the above object, the technology described in claim 6 is based on the technology described in any one of claims 3 to 5, and is characterized in that the connecting portion, together with the anchor portion, is arranged in correspondence with a plurality of locations spaced a predetermined distance apart in the circumferential direction of the valve hole .

According to the configuration of the above technology, in addition to the effect of the technology described in any one of claims 3 to 5, the connecting portions are arranged corresponding to multiple locations in the circumferential direction of the valve hole, so that the sealing member is connected to the valve seat by the connecting portions over the entire circumferential direction of the valve seat.

In order to achieve the above object, the technology described in claim 7 is a technology described in any one of claims 1 to 6 , in which at least one visible identification hole is provided on the periphery of the valve seat in correspondence with the arrangement of the connecting portion.

According to the configuration of the above technology, in addition to the effect of the technology described in any one of claims 1 to 6 , a visible identification hole is provided on the periphery of the valve seat in correspondence with the arrangement of the connecting part, so that when a sealing member is provided on the valve seat, the position of the connecting part can be confirmed by visually inspecting the identification hole.

According to the technology described in claim 1, in a double eccentric valve in which a seal member is provided in a valve hole of a valve seat, it is possible to prevent the seal member from falling off the valve seat due to the sliding of the valve disc or the flow of fluid when the valve is opened. In addition, it is possible to prevent the seal member from falling off the valve seat due to the flow of fluid generated between the first side part of the valve disc on the downstream side of the valve seat after the valve disc is opened.

According to the technology described in claim 2, in a double eccentric valve in which a seal member is provided in a valve hole of a valve seat, it is possible to prevent the seal member from falling off the valve seat due to sliding of the valve body or flow of fluid when the valve is open. Also, it is possible to prevent the seal member from falling off the valve seat due to sliding of a part of the second side that is the farthest from the axis of the rotating shaft or the periphery thereof when the valve body is open.

According to the technique described in claim 3, the same effect as that of claim 1 or 2 can be obtained.

According to the technology described in claim 4, in addition to the effects of the technology described in claim 3, even in a portion of the sealing member where stress occurs due to sliding in the circumferential direction, the anchor portion can be separated from the portion where stress occurs in the radial direction of the thickness of the sealing member, and deterioration and breakage of the anchor portion due to stress can be suppressed.

According to the technology recited in claim 5, in addition to the effects of the technology recited in claim 3 or 4 , even if stress due to sliding with the valve body acts on the anchor part, the tensile length of the anchor part can be sufficiently secured, and tensile breakage of the anchor part can be prevented.

According to the sixth aspect of the present invention, in addition to the effect of the third to fifth aspects of the present invention, it is possible to prevent the seal member from falling off the valve seat over the entire circumferential direction.

According to the technology described in claim 7 , in addition to the effects of the technology described in any one of claims 1 to 6 , when assembling a valve seat provided with a sealing member into a flow path, by using the identification hole as a mark, the invisible connecting part of the sealing member can be positioned in the flow path in accordance with the opening and closing direction (rotation direction) of the valve body.

FIG. 4 is a plan view showing the air valve in a fully closed state in the embodiment. 2 is a cross-sectional view of the valve portion of the air valve in a fully closed state according to the embodiment, taken along line AA in FIG. 1 . FIG. 4 is a cross-sectional view showing the relationship between the valve seat, the valve body, the rotating shaft, and the seal member in a fully closed state in one embodiment. FIG. 4 is a perspective view showing a valve seat provided with a seal member in one embodiment. FIG. 4 is an enlarged cross-sectional view showing a part of a valve seat provided with a seal member, cut in the axial direction, in one embodiment. FIG. 4 is a perspective view showing only the valve seat in the embodiment. FIG. 4 is a plan view showing only the valve seat in the embodiment. FIG. 8 is a cross-sectional view taken along line BB of FIG. 7, showing only the valve seat, in one embodiment. FIG. 4 is a perspective view showing the seal member separated from the valve seat in the embodiment. FIG. 4 is a cross-sectional view showing a valve body of the valve portion when fully closed in the embodiment. FIG. 11 is an enlarged cross-sectional view of a portion of FIG. 10 in accordance with one embodiment. FIG. 4 is a cross-sectional view showing a valve body of the valve portion when the valve starts to open in the embodiment. FIG. 13 is an enlarged cross-sectional view of a portion of FIG. 12 in accordance with one embodiment. FIG. 4 is a cross-sectional view showing a valve body of the valve portion when the valve is open in the embodiment. FIG. 15 is an enlarged cross-sectional view of a portion of FIG. 14 in accordance with one embodiment.

The following describes one embodiment of the double eccentric valve in this disclosed technology. In the following, the double eccentric valve is described as an air valve used to adjust the flow rate of air or the like in a fuel cell system.

[Air valve configuration]
FIG. 1 shows a plan view of an air valve 1 in a fully closed state. FIG. 2 shows a part (valve portion 2) of the air valve 1 in a fully closed state in a cross-sectional view taken along line A-A in FIG. 1. As shown in FIGS. 1 and 2, the air valve 1 includes a valve portion 2 and a drive portion 3. The valve portion 2 includes a metal housing 4, and the housing 4 is provided with a flow path 11 through which air and water flow as fluids. In the flow path 11, a metal valve seat 12, a metal valve element 13 provided corresponding to the valve seat 12, and a part of a metal rotating shaft 14 for rotating the valve element 13 are arranged. In addition, a seal member 15 made of an elastic material such as rubber is provided on the valve seat 12. The seal member 15 is interposed between the valve element 13 and the valve seat 12 when the valve element 13 is seated on the valve seat 12 in a fully closed state, thereby sealing the gap between the valve element 13 and the valve seat 12. The drive unit 3 incorporates a motor 6 and a reduction mechanism 7 that transmits the driving force (rotational force) of the motor 6 to a rotation shaft 14 .

1 and 2, a step 16 is formed in the flow passage 11, and the valve seat 12 is assembled into the step 16. The valve seat 12 is formed into an annular shape by cutting, and has a valve hole 12a (see Figs. 6 and 7) in the center. The valve body 13 has a disk-shaped main body 13a and a protrusion 13b protruding from the center of the main body 13a, and an annular seal surface 13c is formed on the outer periphery of the main body 13a. The seal member 15 is formed into an annular shape corresponding to the valve seat 12, and is provided along the inner circumferential surface of the valve hole 12a. A part of the inner circumferential surface of the seal member 15 is capable of contacting the seal surface 13c of the valve body 13. A pin portion 14a eccentric to the rotary shaft 14 is provided at the tip of the rotary shaft 14. The valve body 13 is fixed to the rotating shaft 14 by assembling the protrusion 13b to the pin portion 14a, and is rotatable integrally with the rotating shaft 14. In Figures 1 and 2, the flow path 11 below the valve seat 12 indicates the upstream side of the fluid flow, and the flow path 11 above the valve body 13 indicates the downstream side of the fluid flow. That is, the valve body 13 is disposed downstream of the valve seat 12 in the flow path 11.

[Configuration of double eccentric valve]
FIG. 3 shows the relationship between the valve seat 12, the valve body 13, the rotating shaft 14, and the seal member 15 in the fully closed state in a cross-sectional view. As shown in FIG. 3, the axis Ls of the rotating shaft 14, which is the rotation center of the valve body 13, extends parallel to the radial direction of the valve body 13, and is disposed away (eccentrically) from the seal surface 13c of the valve body 13 in the direction in which the axis Lv of the valve body 13 extends, and is disposed away (eccentrically) from the axis Lv of the valve body 13 in the radial direction of the valve body 13 (from the center of the valve hole 12a to the radial direction of the valve hole 12a). In this way, the valve unit 2 has a double eccentric valve configuration. Then, by rotating the valve body 13 around the axis Ls of the rotating shaft 14 in the valve opening direction shown by the arrow F1 in FIG. 3, the valve body 13 opens and closes between a fully closed position (shown in FIG. 3) where the seal surface 13c of the valve body 13 contacts the inner peripheral surface of the seal member 15 and a fully open position (not shown) where the valve body 13 is furthest from the inner peripheral surface.

Here, the valve body 13 includes a first side portion 13A (the left side portion of the imaginary plane Sv in FIG. 3) and a second side portion 13B (the right side portion of the imaginary plane Sv in FIG. 3 (shown with dots)) bounded by an imaginary plane Sv that extends parallel to the direction in which the axis Lv of the valve body 13 extends from the axis Ls of the rotating shaft 14. When the valve body 13 begins to rotate in the valve opening direction from a fully closed state in which it is seated on the valve seat 12, the sealing surface 13c of the first side portion 13A rotates in a direction away from the sealing member 15 (valve hole 12a), and the sealing surface 13c of the second side portion 13B rotates in a direction into the inside of the sealing member 15 (valve hole 12a).

[Fixing of the seal member to the valve seat]
FIG. 4 shows a perspective view of the valve seat 12 provided with the seal member 15. FIG. 5 shows an enlarged cross-sectional view of a portion of the valve seat 12 provided with the seal member 15, cut in the axial direction of the valve seat 12. FIG. 6 shows only the valve seat 12 in a perspective view. FIG. 7 shows only the valve seat 12 in a plan view. FIG. 8 shows only the valve seat 12 in a cross-sectional view taken along line B-B in FIG. 7. FIG. 9 shows a perspective view of the seal member 15 separated from the valve seat 12. As shown in FIG. 4, the seal member 15 is provided along the valve hole 12a of the valve seat 12. As shown in FIG. 5, the seal member 15 includes a connecting portion 15a that is mechanically connected to the valve seat 12 so as to enclose a portion (sub-portion 12g) of the valve seat 12. As shown in Fig. 5, the connecting portion 15a is located between the main portion 12h on the outer side of the radial direction Y (the direction shown by the arrow in Fig. 5) of the valve seat 12 and the sub-portion 12g on the radially inner side, and includes an anchor portion 15aa that can engage with the sub-portion 12g. As shown in Fig. 9, the anchor portions 15aa are arranged corresponding to a plurality of positions spaced at predetermined intervals (equidistant intervals) in the circumferential direction of the valve hole 12a. Although not shown, the arrangement of the connecting portion 15a is similar to the arrangement of the anchor portions 15aa shown in Fig. 9. As shown in Figs. 2 and 3, in this embodiment, some of the multiple connecting portions 15a are arranged corresponding to the positions where the first side portion 13A of the valve body 13 is seated on the valve seat 12 via the seal member 15 in the circumferential direction of the valve hole 12a. In addition, one of the multiple connecting portions 15a is positioned in a position corresponding to the portion 13Ba or its vicinity that is the portion in the circumferential direction of the valve hole 12a where the second side portion 13B of the valve body 13 seats on the valve seat 12 via the sealing member 15 and is the portion farthest from the axis Ls of the rotating shaft 14.

As shown in FIG. 5, the valve seat 12 has one end 12b and the other end 12c in the axial direction. In this embodiment, each anchor portion 15aa is arranged in the range from one end 12b to the other end 12c in the axial direction of the valve seat 12. Also, as shown in FIG. 5, the seal member 15 is provided along the inner circumference of the valve hole 12a and has a thickness Ts in the radial direction of the valve hole 12a, and when the valve body 13 is fully closed, the seal surface 13c of the valve body 13 contacts the radial inner side of the thickness Ts. Here, the anchor portion 15aa is arranged on the radial outer side of the thickness Ts of the seal member 15. As shown in FIG. 6 to FIG. 8, the valve seat 12 has a plurality of through holes 12d for providing the anchor portions 15aa of the seal member 15 along the inner surface of the valve hole 12a at equal angular intervals. 6 and 8, the upper and lower sides of this through hole 12d are grooves 12e that open toward the center of the valve hole 12a. Also, as shown in FIG. 6, in this embodiment, a plurality of visible identification holes 12f are provided on the periphery of the valve seat 12 in correspondence with the arrangement of the connecting portion 15a (including the anchor portion 15aa), i.e., in correspondence with the arrangement of the through holes 12d. The number of these identification holes 12f is less than the number of the through holes 12d, but they are arranged at equal angular intervals.

In this embodiment, the seal member 15 is formed by pouring molten elastic material into the valve seat 12 set in a specified mold. At this time, the molten elastic material flows into each through hole 12d and groove 12e of the valve seat 12 to form a connecting portion 15a including an anchor portion 15aa. In this way, a plurality of connecting portions 15a (including anchor portions 15aa) shown in FIG. 9 are formed between the valve seat 12. As shown in FIG. 5, the seal member 15 including the connecting portion 15a is formed so as to encase the sub-portion 12g of the valve seat 12. Note that before pouring the elastic material, an adhesive is applied to the inner surface of the valve hole 12a of the valve seat 12.

[About the function and effect of the air valve]
According to the configuration of the air valve 1 of this embodiment described above, the valve element 13 opens from a fully closed state as follows. Fig. 10 shows a cross-sectional view of the valve element 13 of the valve section 2 when it is fully closed (opening angle: 0°). Fig. 11 shows an enlarged cross-sectional view of a portion of Fig. 10. Fig. 12 shows a cross-sectional view of the valve element 13 of the valve section 2 when it starts to open (opening angle: 3°). Fig. 13 shows an enlarged cross-sectional view of a portion of Fig. 12. Fig. 14 shows a cross-sectional view of the valve element 13 of the valve section 2 when it is open (opening angle: 6°). Fig. 15 shows an enlarged cross-sectional view of a portion of Fig. 14. Figs. 10 to 15 show the arrangement of the air valve 1 in the piping of a fuel cell system.

As shown in Figures 10 and 11, when the valve is fully closed, the entire sealing surface 13c of the valve body 13 is evenly in contact with the inner peripheral surface of the sealing member 15, so that the gap between the valve body 13 and the valve seat 12 is appropriately sealed by the sealing member 15, and the flow path 11 is blocked. In this state, no stress acts to peel the sealing member 15 off the valve seat 12, and leakage of fluid between the valve body 13 and the sealing member 15 can be prevented.

12 and 13, when the valve starts to open, the valve body 13 starts to rotate in the valve opening direction from the fully closed state seated on the seal member 15, and at this time, the first side 13A of the valve body 13 starts to rotate in the direction away from the valve hole 12a, and the second side 13B starts to rotate in the direction into the valve hole 12a. As a result, a stress acts on the part of the seal member 15 corresponding to the first side 13A of the valve body 13 (the lower part in FIG. 12 and the part in FIG. 13) that tries to peel the seal member 15 off the valve seat 12, and a stress acts on the part of the seal member 15 corresponding to the second side 13B of the valve body 13 (the upper part in FIG. 12) that tries to press the seal member 15 against the valve seat 12. However, in this embodiment, the seal member 15 is mechanically connected to the valve seat 12 by its connecting portion 15a, so even if stress due to the sliding of the valve body 13 acts on the portion of the seal member 15 corresponding to the first side portion 13A of the valve body 13 as the valve body 13 rotates when the valve starts to open, the seal member 15 is not pulled off the valve seat 12. This makes it possible to prevent the seal member 15 from falling off the valve seat 12.

14 and 15, when the valve is opened, the valve body 13 rotates further in the valve opening direction from the seal member 15, at which point the first side 13A of the valve body 13 begins to move away from the seal member 15, and the fluid begins to flow through the gap at high speed, and the second side 13B also begins to move away from the seal member 15, and the fluid begins to flow through the gap. Therefore, a stress that tries to peel the seal member 15 off the valve seat 12 acts on the part of the seal member 15 corresponding to the first side 13A of the valve body 13 (the lower part in FIG. 14 and the part in FIG. 15) due to the action of the fluid, and a stress that presses the seal member 15 against the valve seat 12 acts on the part of the seal member 15 corresponding to the second side 13B of the valve body 13 (the upper part in FIG. 14). However, in this embodiment, the seal member 15 is mechanically connected to the valve seat 12 by its connecting portion 15a, so even if stress from the fluid acts on the portion of the seal member 15 corresponding to the first side portion 13A due to the rotation of the valve body 13 when the valve is open, the seal member 15 is not pulled off the valve seat 12. This makes it possible to prevent the seal member 15 from falling off the valve seat 12.

When the valve body 13 rotates further in the valve opening direction from the seal member 15, the first side 13A moves further away from the seal member 15, and a large amount of fluid flows through the gap. The second side 13B also moves away from the seal member 15, and the fluid flows through the gap. At this time, the flow of the fluid acts on the downstream side of the valve seat 12 corresponding to the first side 13A of the valve body 13, and a stress acts to peel the seal member 15 from the valve seat 12. However, in this embodiment, the seal member 15 is mechanically connected to the valve seat 12 by its connecting portion 15a, so that even if a stress due to the flow of the fluid acts on the part of the seal member 15 corresponding to the first side 13A of the valve body 13, the seal member 15 will not be peeled off from the valve seat 12. This makes it possible to prevent the seal member 15 from falling off the valve seat 12.

As described above, according to the configuration of the air valve 1 of this embodiment, when the valve is fully closed, the entire sealing surface 13c of the valve body 13 is evenly in contact with the inner peripheral surface of the sealing member 15, so that the gap between the valve body 13 and the valve seat 12 is suitably sealed by the sealing member 15, and the flow path 11 is blocked. In addition, since the sealing member 15 is mechanically connected to the valve seat 12 by its connecting portion 15a, the sealing member 15 is not pulled away from the valve seat 12 even if stress due to the sliding of the valve body 13 or stress due to the flow of air and water (fluid) acts on the sealing member 15 when the valve is open. More specifically, the anchor portion 15aa of the connecting portion 15a is located between the main portion 12h on the radially outer side of the valve seat 12 and the sub-portion 12g on the radially inner side in the Y direction, and can engage with the sub-portion 12g. Therefore, even if stress due to the sliding of the valve body 13 or stress due to the flow of air and water acts on the seal member 15 when the valve is open, the anchor portion 15aa engages with the sub-portion 12g of the valve seat 12, so that the seal member 15 is not peeled off from the valve seat 12. Therefore, in the air valve 1 having a double eccentric valve configuration in which the seal member 15 is provided in the valve hole 12a of the valve seat 12, it is possible to prevent the seal member 15 from falling off the valve seat 12 due to the sliding of the valve body 13 or the flow of air and water (fluid) when the valve is open.

According to the configuration of this embodiment, when the valve body 13 is opened from the fully closed state shown by the two-dot chain line in FIG. 5, the seal surface 13c of the valve body 13 rotates in the direction of entering the valve hole 12a on the radial inside of the thickness Ts of the seal member 15 and slides against the seal member 15, but the anchor portion 15aa of the seal member 15 is arranged on the radial outside of the thickness Ts. Therefore, even if stress X1 shown by the two-dot chain line occurs due to sliding with the seal surface 13c on the radial inside of the thickness Ts of the seal member 15 when the valve body 13 starts to open, the stress X1 is unlikely to act on the anchor portion 15aa arranged on the radial outside of the thickness Ts. Therefore, even in the part of the seal member 15 where stress X1 occurs due to sliding in the circumferential direction, the anchor portion 15aa can be separated from the part where stress X1 occurs in the radial direction of the thickness Ts, and deterioration and breakage of the anchor portion 15aa due to stress X1 can be suppressed.

According to the configuration of this embodiment, the anchor portion 15aa of the connecting portion 15a is arranged in the axial direction of the valve seat 12 within a range from one end 12b to the other end 12c, and the anchor portion 15aa has a tension length that can sufficiently resist stress. In other words, the length of the anchor portion 15aa is a tensile length that can resist breakage. Therefore, even if stress due to sliding with the valve body 13 acts on the anchor portion 15aa, the tensile length of the anchor portion 15aa can be sufficiently secured, and tensile breakage of the anchor portion 15aa can be prevented.

According to the configuration of this embodiment, the connecting portions 15a of the seal member 15 are arranged to correspond to a plurality of locations in the circumferential direction of the valve hole 12a of the valve seat 12, so that the seal member 15 is connected to the valve seat 12 by the connecting portions 15a over the entire circumferential direction of the valve seat 12. Therefore, it is possible to prevent the seal member 15 from falling off the valve seat over the entire circumferential direction.

According to the configuration of this embodiment, when the valve body 13 starts to rotate from the fully closed state in the valve opening direction, the first side portion 13A of the valve body 13 rotates in a direction away from the valve hole 12a, but the connecting portion 15a of the seal member 15 is arranged in the circumferential direction of the valve hole 12a in a position corresponding to the portion where the first side portion 13A sits on the valve seat 12. Therefore, even if air and water (fluid) flow through the gap between the first side portion 13A and the seal member 15 after the valve body 13 opens and stress due to the flow of air and water acts on the seal member 15 downstream of the valve seat 12, the seal member 15 is not peeled off from the valve seat 12 by the connecting portion 15a. Therefore, after the valve body 13 opens, it is possible to prevent the seal member 15 from falling off from the valve seat 12 due to the flow of air and water (fluid) generated between the first side portion 13A of the valve body 13 and the seal member 15 downstream of the valve seat 12.

According to the configuration of this embodiment, when the valve body 13 starts to rotate from the fully closed state in the valve opening direction, the second side portion 13B of the valve body 13 rotates in the direction into the valve hole 12a, but one of the connecting portions 15a of the seal member 15 is arranged in the circumferential direction of the valve hole 12a in correspondence with the portion 13Ba where the second side portion 13B sits on the valve seat 12 and is the furthest from the axis Ls of the rotating shaft 14, or its periphery. Therefore, even if stress is applied to the seal member 15 due to the sliding of the valve body 13 when the valve body 13 is opened, the seal member 15 is not peeled off from the valve seat 12 by the connecting portion 15a. Therefore, when the valve body 13 is opened, it is possible to prevent the seal member 15 from falling off the valve seat 12 due to sliding of the portion 13Ba, which is the part of the second side portion 13B and is the furthest from the axis Ls of the rotating shaft 14, or its periphery.

According to the configuration of this embodiment, a visible identification hole 12f is provided on the periphery of the valve seat 12 in correspondence with the arrangement of the connecting portion 15a (including the anchor portion 15aa) of the seal member 15, so that when the seal member 15 is provided on the valve seat 12, the position of the connecting portion 15a can be confirmed by visually checking the identification hole 12f. Therefore, when the valve seat 12 provided with the seal member 15 is assembled to the flow path 11, the invisible connecting portion 15a of the seal member 15 can be positioned in the flow path 11 in accordance with the opening/closing direction (rotation direction) of the valve body 13 by using the identification hole 12f as a mark.

The disclosed technology is not limited to the above-described embodiment, and parts of the configuration can be modified as appropriate without departing from the spirit of the disclosed technology.

(1) In the above embodiment, the double eccentric valve of the disclosed technology is embodied in an air valve used to adjust the flow rate of a fluid such as air in a fuel cell system, but the double eccentric valve can also be embodied in a valve device such as an EGR valve provided in an engine.

(2) In the above embodiment, the connecting portion 15a including the anchor portion 15aa is disposed on the seal member 15 in correspondence with a plurality of locations equiangularly spaced in the circumferential direction of the valve hole 12a. In contrast, the connecting portion including the anchor portion may be disposed on the seal member only in a portion that is susceptible to stress due to the sliding of the valve body when the valve body is open, or only in a portion that is susceptible to stress due to the flow of fluid when the valve body is open.

(3) In the above embodiment, the valve seat 12 was formed by cutting metal, but the metal of the valve seat can also be press-formed.

The disclosed technology can be used in valve devices used to regulate the flow rate of fluids.

4 Housing 11 Flow path 12 Valve seat 12a Valve hole 12b One end 12c Other end 12f Identification hole 12g Sub-part (part)
12h Main portion 13 Valve body 13c Seal surface 13A First side portion 13B Second side portion 14 Rotary shaft 15 Seal member 15a Connecting portion 15aa Anchor portion 22 Valve seat 22a Valve hole 22b Inner half portion (part)
22c Main section Ls axis (of the rotation axis)
Lv Axis (of the valve body)
Sv Virtual surface Ts Thickness

Claims (7)

a housing including a flow path through which a fluid flows;
a valve seat provided in the flow path and having a valve hole;
a valve body having a seal surface formed on an outer periphery thereof and provided in correspondence with the valve seat;
a seal member made of an elastic material that is provided on the valve seat and that is interposed between the valve body and the valve seat when the valve body is seated on the valve seat and in a fully closed state to seal between the valve body and the valve seat;
a rotation shaft for rotating the valve body, wherein an axis of the rotation shaft, which is a rotation center of the valve body, is disposed away from the seal surface of the valve body in a direction in which the axis of the valve body extends, and is disposed away from the axis of the valve body in a radial direction of the valve body,
The seal member includes a connecting portion that is mechanically connected to the valve seat so as to enclose a portion of the valve seat, the connecting portion being disposed in correspondence with at least one location in a circumferential direction of the valve hole ,
the valve body includes a first side portion and a second side portion, the boundary of which is defined by an imaginary plane extending parallel to the direction in which the axis of the valve body extends from the axis of the rotation shaft, and when the valve body begins to rotate in a valve opening direction from a fully closed state in which the valve body is seated on the valve seat, the first side portion rotates in a direction away from the valve hole, and the second side portion rotates in a direction into the valve hole,
The connecting portion is disposed in a circumferential direction of the valve hole in a position corresponding to a position where the first side portion of the valve body is seated on the valve seat.
A double eccentric valve. a housing including a flow path through which a fluid flows;
a valve seat provided in the flow path and having a valve hole;
a valve body having a seal surface formed on an outer periphery thereof and provided in correspondence with the valve seat;
a seal member made of an elastic material that is provided on the valve seat and that is interposed between the valve body and the valve seat when the valve body is seated on the valve seat and in a fully closed state to seal between the valve body and the valve seat;
a rotation shaft for rotating the valve body;
wherein an axis of the rotation shaft, which is a rotation center of the valve body, is disposed away from the seal surface of the valve body in a direction in which the axis of the valve body extends, and is disposed away from the axis of the valve body in a radial direction of the valve body.
In a double eccentric valve comprising:
The seal member includes a connecting portion that is mechanically connected to the valve seat so as to enclose a portion of the valve seat, the connecting portion being disposed in correspondence with at least one location in a circumferential direction of the valve hole,
the valve body includes a first side portion and a second side portion, the boundary of which is defined by an imaginary plane extending parallel to the direction in which the axis of the valve body extends from the axis of the rotation shaft, and when the valve body begins to rotate in a valve opening direction from a fully closed state in which the valve body is seated on the valve seat, the first side portion rotates in a direction away from the valve hole, and the second side portion rotates in a direction into the valve hole,
The connecting portion is arranged in a circumferential direction of the valve hole at a portion where the second side of the valve body seats on the valve seat and corresponds to a portion farthest from the axis of the rotating shaft or its vicinity . The double eccentric valve according to claim 1 or 2 ,
A double eccentric valve, characterized in that the connecting portion includes an anchor portion located between a main portion radially outward of the valve seat and a sub-portion radially inward of the valve seat and capable of engaging with the sub-portion. 4. The double eccentric valve according to claim 3 ,
the seal member is provided along an inner circumference of the valve hole and has a thickness in a radial direction of the valve hole, and when the valve body is fully closed, the seal surface of the valve body contacts a radially inner side of the thickness,
The anchor portion is disposed radially outward of the thickness. The double eccentric valve according to claim 3 or 4 ,
The valve seat has one end and the other end in its axial direction,
The anchor portion is disposed within a range from the one end to the other end of the valve seat in the axial direction. The double eccentric valve according to any one of claims 3 to 5 ,
A double eccentric valve, characterized in that the connecting portions, together with the anchor portions, are arranged corresponding to a plurality of locations spaced apart by a predetermined distance in the circumferential direction of the valve hole. 7. The double eccentric valve according to claim 1,
A double eccentric valve, characterized in that at least one visible identification hole is provided on the periphery of the valve seat in correspondence with the arrangement of the connecting portion.

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