Double Eccentric Valve

Abstract

To provide a double eccentric valve in which a seal member is provided in a valve hole of a valve seat and the seal member is prevented from falling off from the valve seat due to sliding of a valve element or flow of a fluid when the valve is opened.SOLUTION: A double eccentric valve includes a valve seat 12 provided in a flow passage of a housing, a valve element 13 provided corresponding to the valve seat 12, a seal member 15 that is provided on the valve seat 12, is interposed between the valve element 13 and the valve seat 12 to seal between the valve element 13 and the valve seat 12 when the valve is fully closed, and is made of an elastic material, and a rotation shaft 14 for rotating the valve element 13. The seal member 15 includes a connection portion 15a mechanically connected to the valve seat 12 so as to wrap a part of the valve seat 12, and the connection portion 15a is disposed corresponding to at least one location in the circumferential direction of the valve hole 12a. The connection portion 15a is positioned between a radially outer main portion 12h and a radially inboard secondary portion 12g of the valve seat 12, and includes an anchor portion 15aa engageable with the secondary portion 12g.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The technology disclosed in this specification relates to a double eccentric valve in which the axis of a rotation shaft about which the valve body rotates is positioned away from the seal surface of the valve body and also away from the axis of the valve body. [Background technology]

[0002] Conventionally, as this type of technology, for example, a "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 having a seal surface formed on the outer periphery and provided corresponding to the valve seat, a seal 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 disposed away from the seal surface of the valve body and is also disposed away from the axis of the valve body. Here, the seal member is disposed along the inner periphery of the valve hole of the valve seat and can be fixed by bonding with an adhesive. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-66386 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, the double eccentric valve described in Patent Document 1 may be used as an air valve for adjusting the flow rate of air or the like in a fuel cell system. In this case, if air or the like flows between the valve body and the seal member when the double eccentric valve is opened, the flow may act on the seal member or adhesive, causing the adhesive strength of the adhesive to decrease or the adhesive to flow out. In addition, when the valve is opened, the valve body slides on the seal member, and the sliding stress acts on the seal member. As a result, there is a risk that the seal member will be torn off from the valve seat and fall off.

[0005] This disclosed technology has been made in consideration of the above-mentioned circumstances, and its purpose is to prevent, in a double eccentric valve in which a seal member is provided in a valve hole in a valve seat, the seal member from falling off the valve seat due to the sliding of the valve body or the flow of fluid when the valve is opened. [Means for solving the problem]

[0006] In order to achieve the above object, the technology described in claim 1 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 in a fully closed state 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 seal member includes a connecting portion mechanically connected to the valve seat so as to enclose a portion of the valve seat, and the connecting portion is disposed 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 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 starts to rotate in the 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, and the connecting portion is disposed in a circumferential direction of the valve hole corresponding to a portion where the first side portion of the valve body sits on the valve seat. The purpose of this document is to

[0007] According to the configuration of the above technology, when the valve is fully closed, the entire sealing surface of the valve disc is evenly in contact with the inner peripheral surface of the seal member, so that the gap between the valve disc 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 connection portion, the seal member will not be pulled off from the valve seat even if stress due to the sliding of the valve disc or stress due to the flow of the fluid acts on the seal member when the valve is open. Furthermore, when the valve disc begins to rotate from the fully closed state in the opening direction, the first side of the valve disc rotates in a direction away from the valve hole, but the connecting portion is disposed in a position in the circumferential direction of the valve hole corresponding to the portion where the first side of the valve disc seats on the valve seat. Therefore, even if fluid flows through the gap between the first side and the seal member after the valve disc opens and stress due to the fluid flow acts on the seal member downstream of the valve seat, the connecting portion will not pull the seal member off the valve seat.

[0008] In order to achieve the above object, the technology described in claim 2 is as follows: 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 seal member being disposed on a part of the valve seat. a connecting part that is mechanically connected to the valve seat so as to enclose the valve seat, the connecting part being disposed corresponding to at least one location in the circumferential direction of the valve hole, the valve body having a first side part and a second side part bounded 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, when the valve body starts to rotate in the valve opening direction from a fully closed state in which it is seated on the valve seat, the first side part rotates in a direction away from the valve hole, and the second side part rotates in a direction into the valve hole, and the connecting part is disposed corresponding to a location in the circumferential direction of the valve hole where the second side part of the valve body sits on the valve seat and is the furthest from the axis of the rotation shaft or a periphery thereof. The purpose of this document is to

[0009] 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 seal member effectively seals the gap between the valve body and the valve seat, and the flow path is blocked. In addition, the seal member is mechanically connected to the valve seat by the connecting portion, so that 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. When the valve body starts to rotate from the fully closed state to the opening direction, the second side 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 sits on the valve seat and is farthest from the axis of the rotation shaft, or in the vicinity of that portion. Therefore, even if stress due to the sliding of the valve body acts on the seal member when the valve body is opened, the seal member is not peeled off from the valve seat by the connecting portion.

[0010] In order to achieve the above object, the technology described in claim 3 is 1 or 2 In the technique described in The connecting portion is located between a main portion on the radially outer side of the valve seat and a sub-portion on the radially inner side of the valve seat and includes an anchor portion engageable with the sub-portion. The purpose of this document is to

[0011] According to the above-mentioned technical configuration, 1 or 2 In addition to the effects of the technology described above, Since the anchor portion is located between the main portion radially outward of the valve seat and the sub-portion radially inward and is capable of engaging with the sub-portion, 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, so that the sealing member is not pulled off from the valve seat.

[0012] In order to achieve the above object, the technology described in claim 4 is 3 In the technique described in The seal member is provided along the inner circumference of the valve hole and has a thickness in the radial direction of the valve hole. When the valve body is fully closed, the seal surface of the valve body contacts the radially inner side of the thickness. The anchor portion contacts the radially outer side of the thickness. The purpose is to be placed.

[0013] According to the above-mentioned technical configuration, 3 In addition to the effects of the technology described above, 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 located on the radially outer side of the thickness of the seal member. Therefore, even if stress is generated on the radially inner side of the thickness of the seal member due to sliding with the seal surface when the valve starts to open, the stress is unlikely to act on the anchor portion located on the radially outer side of the thickness.

[0014] In order to achieve the above object, the technology described in claim 5 is 3 or 4 In the technique described in The valve seat has one end and the other end in its axial direction, and the anchor portion is within a range from the one end to the other end in the axial direction of the valve seat. The purpose is that they will be placed in accordance with the above.

[0015] According to the above-mentioned technical configuration, 3 or 4 In addition to the effects of the technology described above, 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.

[0016] In order to achieve the above object, the technology described in claim 6 is 3 6. In the technique according to any one of claims 1 to 5, The connecting portion is connected to the anchor portion at a plurality of points spaced apart from each other in the circumferential direction of the valve hole. The purpose is that they will be placed in accordance with the above.

[0017] According to the above-mentioned technical configuration, 3 In addition to the effects of any one of the techniques described in the above, The connecting portions are disposed corresponding to a plurality of positions in the circumferential direction of the valve hole, so that the seal member is connected to the valve seat by the connecting portions over the entire circumferential direction of the valve seat.

[0020] In order to achieve the above object, claims 7 The technology described in claims 1 to 6 In any one of the techniques described above, at least one visible identification hole is provided on the periphery of the valve seat in correspondence with the arrangement of the connecting portion.

[0021] According to the configuration of the above technology, claims 1 to 6 In addition to the effect of any one of the techniques described above, 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. Effect of the Invention

[0022] According to the technology recited 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 sliding of the valve disc or flow of fluid when the valve is opened. Furthermore, after the valve body opens, it is possible to prevent the seal member from falling off the valve seat due to a flow of fluid that occurs between the first side portion of the valve body and the downstream side of the valve seat.

[0023] 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 its periphery when the valve body is open.

[0024] According to the technology described in claim 3, The same effect as 1 or 2 can be obtained.

[0025] According to the technology described in claim 4, In addition to the effect of the technology described in 3, even in the area where stress occurs in the circumferential direction of the sealing member due to sliding, the anchor part can be separated from the area where stress occurs in the radial direction of the thickness of the sealing member, thereby suppressing deterioration and breakage of the anchor part due to stress.

[0026] According to the technology described in claim 5, 3 or 4 In addition to the effects of the technology described above, Even if stress due to sliding with the valve body acts on the anchor portion, the tensile length of the anchor portion can be sufficiently ensured, and tensile breakage of the anchor portion can be prevented.

[0027] According to the technology described in claim 6, 3 In addition to the effects of any one of the techniques described in the above to 5, The seal member can be prevented from falling off the valve seat over the entire circumferential direction.

[0029] Claim 7 According to the technology described in claims 1 to 6 In addition to the effects of any one of the techniques described above, 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 / closing direction (rotation direction) of the valve body. [Brief description of the drawings]

[0030] [Figure 1] FIG. 4 is a plan view showing the air valve in a fully closed state in the embodiment. [Diagram 2] 2 is a cross-sectional view taken along line AA in FIG. 1, showing a valve portion of the air valve in a fully closed state in the embodiment. [Diagram 3] 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. [Figure 4] FIG. 4 is a perspective view showing a valve seat provided with a seal member in one embodiment. [Diagram 5] 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. [Figure 6] FIG. 4 is a perspective view showing only the valve seat in the embodiment. [Figure 7] FIG. 4 is a plan view showing only the valve seat in the embodiment. [Figure 8] 8 is a cross-sectional view taken along line BB in FIG. 7, showing only the valve seat in the embodiment. [Figure 9] FIG. 4 is a perspective view showing the seal member separated from the valve seat in the embodiment. [Figure 10] FIG. 4 is a cross-sectional view showing a valve body of the valve portion when fully closed in the embodiment. [Figure 11] FIG. 11 is an enlarged cross-sectional view showing a portion of FIG. 10 in one embodiment. [Figure 12]FIG. 4 is a cross-sectional view showing a valve body of the valve portion when the valve starts to open in the embodiment. [Figure 13] FIG. 13 is an enlarged cross-sectional view showing a portion of FIG. 12 in one embodiment. [Figure 14] FIG. 4 is a cross-sectional view showing a valve body of the valve portion when the valve is open in the embodiment. [Figure 15] FIG. 15 is an enlarged cross-sectional view showing a portion of FIG. 14 in one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] Hereinafter, an embodiment of the double eccentric valve according to the disclosed technology will be described. In the following, the double eccentric valve will be described as an air valve used to adjust the flow rate of air or the like in a fuel cell system.

[0032] [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 section 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 section 2 and a drive section 3. The valve section 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 rotary 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 includes a motor 6 and a speed reducer 7 that transmits the driving force (rotational force) of the motor 6 to a rotation shaft 14.

[0033] As shown in Figs. 1 and 2, a step 16 is formed in the flow passage 11, and the valve seat 12 is assembled in the step 16. The valve seat 12 is formed in 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 in 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 having its protrusion 13b assembled to the pin portion 14a, and is capable of rotating 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.

[0034] [About the structure of the 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. By rotating the valve body 13 around the axis Ls of the rotating shaft 14 in the valve opening direction indicated by the arrow F1 in FIG. 3, the valve body 2 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.

[0035] 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 starts 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).

[0036] [Fixing 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 part 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 BB 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 part of the valve seat 12 (the sub-portion 12g). 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 FIG. 2 and FIG. 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 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 farthest from the axis Ls of the rotating shaft 14.

[0037] 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 disposed in the range from the one end 12b to the other end 12c in the axial direction of the valve seat 12. 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. 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 disposed 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 at equal angular intervals along the inner surface of the valve hole 12a. In FIG. 6 and FIG. 8, the upper and lower sides of the through holes 12d are grooves 12e that open toward the center of the valve hole 12a. 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.

[0038] In this embodiment, the seal member 15 is formed by pouring a molten elastic material into the valve seat 12 set in a predetermined 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 manner, a plurality of connecting portions 15a (including an anchor portion 15aa) shown in FIG. 9 are formed between the seal member 15 and the valve seat 12. As shown in FIG. 5, the seal member 15 including the connecting portion 15a is formed so as to enclose 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.

[0039] [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.

[0040] 10 and 11, when 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 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.

[0041] 12 and 13, when the valve starts to open, the valve element 13 starts to rotate in the valve opening direction from the fully closed state in which it is seated on the seal member 15, and at this time, the first side portion 13A of the valve element 13 starts to rotate in the direction away from the valve hole 12a, and the second side portion 13B starts to rotate in the direction into the valve hole 12a. As a result, a stress acts on the portion of the seal member 15 corresponding to the first side portion 13A of the valve element 13 (the lower portion in FIG. 12 and the portion in FIG. 13) that tries to peel the seal member 15 off the valve seat 12, and a stress acts on the portion of the seal member 15 corresponding to the second side portion 13B of the valve element 13 (the upper portion in FIG. 12) that tries to press the seal member 15 against the valve seat 12. However, in this embodiment, since the seal member 15 is mechanically connected to the valve seat 12 by the connecting portion 15a, even if stress due to the sliding of the valve disc 13 acts on the portion of the seal member 15 corresponding to the first side portion 13A of the valve disc 13 as the valve disc 13 rotates when the valve starts to open, the seal member 15 is not peeled off from the valve seat 12. Therefore, it is possible to prevent the seal member 15 from falling off the valve seat 12.

[0042] 14 and 15, when the valve is opened, the valve element 13 rotates further in the valve opening direction from the seal member 15, at which time the first side 13A of the valve element 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 from the valve seat 12 acts on the portion of the seal member 15 corresponding to the first side 13A of the valve element 13 (the lower portion in FIG. 14 and the portion 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 portion of the seal member 15 corresponding to the second side 13B of the valve element 13 (the upper portion in FIG. 14). However, in this embodiment, since the seal member 15 is mechanically connected to the valve seat 12 by the connecting portion 15a, 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 opened, the seal member 15 will not be peeled off from the valve seat 12. Therefore, it is possible to prevent the seal member 15 from falling off the valve seat 12.

[0043] When the valve body 13 further rotates in the valve opening direction from the seal member 15, the first side portion 13A further separates from the seal member 15, and a large amount of fluid flows through the gap. The second side portion 13B also separates 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 portion 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, since the seal member 15 is mechanically connected to the valve seat 12 by the connecting portion 15a, even if a stress due to the flow of the fluid acts on the portion of the seal member 15 corresponding to the first side portion 13A of the valve body 13, the seal member 15 will not be peeled off from the valve seat 12. Therefore, it is possible to prevent the seal member 15 from falling off the valve seat 12.

[0044] 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 close 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 will not be peeled off 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 radial direction Y, and is engageable with the sub-portion 12g, so that 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, and 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 from 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.

[0045] 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 radially inner side of the thickness Ts of the seal member 15 and slides on the seal member 15, but the anchor portion 15aa of the seal member 15 is disposed on the radially outer side of the thickness Ts. Therefore, even if the stress X1 shown by the two-dot chain line occurs due to sliding with the seal surface 13c on the radially inner side 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 disposed on the radially outer side of the thickness Ts. Therefore, even in the portion of the seal member 15 where the stress X1 occurs due to sliding in the circumferential direction, the anchor portion 15aa can be separated from the portion where the stress X1 occurs in the radial direction of the thickness Ts, and deterioration and breakage of the anchor portion 15aa due to the stress X1 can be suppressed.

[0046] According to the configuration of this embodiment, the anchor portion 15aa of the connecting portion 15a is disposed within a range from one end 12b to the other end 12c in the axial direction of the valve seat 12, 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.

[0047] According to the configuration of this embodiment, the connecting portions 15a of the seal member 15 are disposed corresponding to a plurality of positions 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.

[0048] 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 disposed in the circumferential direction of the valve hole 12a in a position corresponding to the position 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, 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 after the valve body 13 opens.

[0049] 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 disposed in the circumferential direction of the valve hole 12a in correspondence with the portion 13Ba, which is the portion where the second side portion 13B is seated 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 as a result of the rotation 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 from the valve seat 12 due to the 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.

[0050] According to the configuration of this embodiment, visible identification holes 12f are provided on the periphery of the valve seat 12 in correspondence with the arrangement of the connecting portions 15a (including anchor portions 15aa) of the seal member 15, so that when the seal member 15 is provided on the valve seat 12, it is possible to confirm the position of the connecting portions 15a by visually checking the identification holes 12f. Therefore, when the valve seat 12 provided with the seal member 15 is assembled to the flow path 11, the invisible connecting portions 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 disc 13 by using the identification holes 12f as a mark.

[0051] It should be noted that the disclosed technology is not limited to the above-described embodiment, and parts of the configuration can be appropriately modified and implemented without departing from the spirit of the disclosed technology.

[0052] (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. However, this double eccentric valve can also be embodied in a valve device such as an EGR valve provided in an engine.

[0053] (2) In the above embodiment, the connecting portions 15a including the anchor portions 15aa are disposed on the seal member 15 in correspondence with a plurality of locations equiangularly spaced in the circumferential direction of the valve hole 12a. However, the connecting portions including the anchor portions may be disposed on the seal member only in locations that are susceptible to stress due to the sliding movement of the valve disc when the valve disc is open, or only in locations that are susceptible to stress due to the flow of fluid when the valve disc is open.

[0054] (3) In the above embodiment, the valve seat 12 is formed by cutting a metal. However, the metal of the valve seat may be press-formed. [Industrial Applicability]

[0055] The disclosed technology can be utilized in valve devices used to regulate the flow rate of fluids. [Explanation of symbols]

[0056] 4. Housing 11 Flow Path 12 Valve seat 12a Valve hole 12b One end 12c Other end 12f Identification hole 12g subpart (part) 12h Main section 13 Valve body 13c Sealing surface 13A First Side 13B Second Side 14 Rotational Axis 15 Sealing material 15a Connection part 15aa Anchor part 22 Valve seat 22a Valve hole 22b Inner half part (part) 22c Main part Ls axis (rotation axis) Lv Axis (of valve body) Sv Virtual Surface Ts Thickness

Claims

1. 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 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.

2. 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 an outer periphery formed with a seal surface 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 bounded 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 at a portion where the second side portion of the valve body is seated on the valve seat and is farthest from the axis of the rotary shaft or in a vicinity thereof. A double eccentric valve.

3. The double eccentric valve according to claim 1 or 2, The connecting portion is located between a main portion on the radially outer side of the valve seat and a sub-portion on the radially inner side of the valve seat and includes an anchor portion engageable with the sub-portion. A double eccentric valve.

4. 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. A double eccentric valve.

5. 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 in the axial direction of the valve seat. A double eccentric valve.

6. The double eccentric valve according to any one of claims 3 to 5, The connecting portion and the anchor portion are disposed at a plurality of locations spaced apart from each other at predetermined intervals in the circumferential direction of the valve hole. A double eccentric valve.

7. 7. The double eccentric valve according to claim 1, At least one visible identification hole is provided on the periphery of the valve seat in correspondence with the arrangement of the connecting portion. A double eccentric valve.

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