Valve device

Abstract

The present application discloses a valve device provided with a rotation shaft, a valve core, and a force applying portion. The valve core is configured to be rotatably displaced between a closed position and an open position with the rotation shaft as the center. The force applying portion applies force to the valve core in a manner that the valve core tends to the closed position. The valve core has an upstream wall configured at a position on the upstream side of the rotation shaft in the flow direction of fluid when the valve core is in the closed position. The valve core has a turning end portion which is an end portion of the valve core away from the rotation shaft and which is an end portion moving toward the downstream side of the flow direction of fluid when the valve core has been displaced from the closed position to the open position. The turning end portion has a shape protruding toward the upstream side when the valve core is in the closed position.

Description

Technical Field

[0001] This disclosure relates to valve devices installed on pipes for the flow of fluid. Background Technology

[0002] Conventional valve devices installed on exhaust gas pipes are known. As an example, in the valve device disclosed in Patent Document 1 (Japanese Patent Application Publication No. 2016-79807), a valve core that opens and closes a pipe supplying exhaust gas from a vehicle engine is integrated with a rotating shaft that passes through the pipe. A connecting rod arm is provided on the portion of this rotating shaft that protrudes outside the pipe. A spring connected to the connecting rod arm applies force to the valve core, causing it to rotate towards a closed position. The closed position here refers to the rotational position of the valve core when the valve device's opening is at its minimum. As another example, the valve device disclosed in Patent Document 2 (Japanese Patent Application Publication No. 2017-133665) is configured to close a passage located downstream or upstream of the valve core's shaft. Furthermore, the rotation angle of the valve core in this valve device is controlled by an external drive source. Summary of the Invention

[0003] As shown in Patent Document 1 above, in a structure that uses a spring or the like to apply force to the valve core toward the closed position, in order to achieve the goal of increasing the valve opening degree as the discharge gas flow rate increases, the structure is configured such that the force applied to the valve core decreases as it approaches the closed position. Furthermore, as the valve core approaches the open position and the opening degree increases, the deformation of the spring also increases, thereby increasing the force exerted by the spring.

[0004] When the valve core is in the closed position, if it is at a near right angle to the flow direction of the exhaust gas, it can effectively withstand the force from the exhaust gas. However, if the valve core rotates, reducing its tilt angle relative to the flow direction, it becomes difficult to withstand the force from the exhaust gas. This results in the following problem: if the valve core tilts significantly, increasing the opening, the force applied by the spring becomes stronger, leading to a decrease in the efficiency of the valve core in receiving force from the exhaust gas. Therefore, it becomes difficult to control the valve opening using the exhaust gas flow rate.

[0005] One aspect of this disclosure is to effectively withstand forces from the fluid when the valve device is at a large opening.

[0006] One aspect of this disclosure is a valve device disposed on a pipeline for fluid flow, comprising a rotating shaft, a valve core, and a force-applying part. The valve core is configured to rotate about the rotating shaft between a closed position and an open position. The closed position is a position where the valve core significantly obstructs the pipeline, and the open position is a position where the obstruction is relatively minor. The force-applying part applies force to the valve core in a manner that tends it towards the closed position. The valve core has an upstream wall, which, when the valve core is in the closed position, is positioned upstream of the rotating shaft in the direction of fluid flow. The valve core has a rotating end, which is the end of the valve core furthest from the rotating shaft and moves downstream in the direction of fluid flow as the valve core has moved from the closed position to the open position. When the valve core is in the closed position, the rotating end has a shape that protrudes upstream.

[0007] According to the structure described above, when the valve core is in the closed position, the rotational force from the fluid is small. However, when the valve core has shifted from the closed position to the open position, it can effectively withstand the force from the fluid, thereby increasing the rotational force towards the open position. This makes it easier to maintain a large valve opening, thus enabling good control of the fluid flow rate.

[0008] In the valve device described above, the rotating end of the valve core can be located on the upstream wall. When the valve core is in the closed position, the downstream surface of the upstream wall facing upstream can be planar, wherein this portion is the portion of the upstream wall located on the opposite side of the rotating end. In the structure described above, when the valve core is in the closed position, it is easily subjected to a force from the fluid that moves the valve core toward the closed position (i.e., a rotational force intended to hold the valve core in the closed position). Therefore, when the valve core is in the closed position, it is possible to suppress the valve core from rotating toward the open position due to a small flow rate of fluid.

[0009] In the valve device described above, the rotating shaft can be positioned radially spaced from the central axis of the pipe. When the valve core is in the closed position, the rotating end of the upstream wall and the rotating shaft can be positioned opposite each other with respect to the central axis. According to the structure described above, the range of forces that cause the upstream wall to tend towards the open position when pushed by the fluid is increased. Therefore, when the upstream wall is pushed by the fluid, a rotational force tending towards the open position can be reliably generated.

[0010] In the aforementioned valve assembly, the rotating shaft can be fixed directly or indirectly to the pipeline in a non-rotatable manner. The force-applying part can be a spring member that applies force to the valve core using elasticity, and can be disposed inside the pipeline. One end of the force-applying part can be connected to the rotating shaft, and the other end can be connected to the valve core. According to the structure described above, the force-applying part can be disposed inside the pipeline, thus eliminating the need for space outside the pipeline for its placement. Since the force-applying part is connected to both the rotating shaft and the valve core, it is located near the valve core, thereby enabling miniaturization even inside the pipeline. Furthermore, the force-applying part can also be disposed inside the valve core. Attached Figure Description

[0011] Figure 1 This is a cross-sectional view of the valve device according to the first embodiment.

[0012] Figure 2A This is a cross-sectional view of the valve device of the first embodiment in the closed position.

[0013] Figure 2B This is a cross-sectional view of the valve device of the first embodiment, which has been rotated 30°.

[0014] Figure 2C This is a cross-sectional view of the valve device of the first embodiment, which has been rotated 60°.

[0015] Figure 2D This is a cross-sectional view of the valve device of the first embodiment in the open position.

[0016] Figure 2E This is a diagram of the valve device of the first embodiment as viewed from the upstream side, and it is related to... Figure 2A The corresponding diagram.

[0017] Figure 2F This is a diagram of the valve device of the first embodiment as viewed from the upstream side, and it is related to... Figure 2B The corresponding diagram.

[0018] Figure 2G This is a diagram of the valve device of the first embodiment as viewed from the upstream side, and it is related to... Figure 2C The corresponding diagram.

[0019] Figure 2H This is a diagram of the valve device of the first embodiment as viewed from the upstream side, and it is related to... Figure 2D The corresponding diagram.

[0020] Figure 3A This is a side view illustrating the effect of the rotating end warping towards the upstream side.

[0021] Figure 3BThis is a side view illustrating the effect of the rotating end warping towards the upstream side.

[0022] Figure 4A This is a diagram of the valve device as observed from the upstream side when the tilt angle of the valve core in the valve device of the first comparative example is 30°.

[0023] Figure 4B This is a diagram of the valve device as observed from the upstream side when the tilt angle of the valve core in the valve device of the first comparative example is 60°.

[0024] Figure 4C This is a diagram of the valve device as seen from the upstream side when the tilt angle of the valve core in the valve device of the first embodiment is 30°.

[0025] Figure 4D This is a diagram of the valve device as seen from the upstream side when the tilt angle of the valve core in the valve device of the first embodiment is 60°.

[0026] Figure 5A This is a side view illustrating the effect of the upstream wall shifting upstream from the rotation axis.

[0027] Figure 5B This is a side view illustrating the effect of the upstream wall shifting upstream from the rotation axis.

[0028] Figure 6 This is a cross-sectional view of the valve device according to the second embodiment.

[0029] Figure 7A This is a side view showing the valve device according to the third embodiment.

[0030] Figure 7B This is a side view showing the valve device according to the third embodiment.

[0031] Figure 8A This is a perspective view showing the valve device according to the third embodiment.

[0032] Figure 8B This is a cross-sectional view of the valve device according to the third embodiment.

[0033] Figure 9 This is a side view showing a modified example of the valve device.

[0034] Figure 10 This is a side view showing a modified example of the valve device.

[0035] Figure 11 This is a side view showing a modified example of the valve device. Detailed Implementation

[0036] Exemplary embodiments of this disclosure are described below with reference to the accompanying drawings. The embodiments of this disclosure are not limited to those described below, and various embodiments can be employed within the scope of the art to which this disclosure pertains.

[0037] [1. First Embodiment]

[0038] [1-1. Overall Structure]

[0039] like Figure 1 as well as Figure 2A-2H As shown, the valve device 1 of the first embodiment is a valve device disposed on a fluid flow conduit 3. In this embodiment, the conduit 3 is used as an exhaust pipe for supplying exhaust gas from a vehicle engine. Hereinafter, exhaust gas will be used as an example of a fluid. The valve device 1 can be disposed at any location on the exhaust pipe; for example, it can be disposed at the inner pipe of a muffler installed in the flow path of the vehicle's exhaust gas. As an example, the conduit 3 is a cylindrical component that extends in a generally straight line. Hereinafter, the line passing through the conduit 3 and approximately at the center of a cross-section cut by a plane orthogonal to the exhaust gas flow direction is referred to as the central axis 3a. The valve device 1 is configured to adjust the opening of the flow path formed by the conduit 3, and the valve device 1 has a rotating shaft 11, an upstream wall 13, a support body 15, and a force-applying part 17. The valve core 19 includes the upstream wall 13 and the support body 15.

[0040] The rotating shaft 11 is a rod-shaped component fixed to the pipe 3 and serves as the rotation center of the valve core 19. The rotating shaft 11 only needs to be configured to allow the valve core 19 to rotate around it; its specific structure is not particularly limited. For example... Figure 2H As shown, the rotating shaft 11 is disposed inside the pipe 3 and is positioned to penetrate the wall of the pipe 3. Figure 1 As shown, the rotating shaft 11 is positioned radially spaced from the central axis 3a of the pipe 3.

[0041] The upstream wall 13 is a component that adjusts the opening of the flow path inside pipe 3, such as... Figure 2E-2H As shown, the upstream wall 13 is a generally disc-shaped component. The upstream wall 13 is a wall component in the valve core 19 that forms the upstream side of the valve core 19 in the direction of gas flow. The upstream wall 13 is configured to rotate about the rotation axis 11. (Refer to...) Figure 2A-2H To illustrate the rotational motion of the upstream wall 13. Figures 2A-2D It is a sectional view cut by a plane passing through the central axis 3a of pipe 3 and orthogonal to the axis of rotation 11. Figure 2E-2H This is a diagram of valve device 1 as seen from the upstream side of pipe 3.

[0042] Figure 2AThis illustrates the situation where valve core 19 is in the closed position. The closed position is the position where the degree of blockage of the conduit 3 by valve core 19 is relatively large. The degree of blockage here refers to the degree to which the exhaust gas is difficult to flow. In this embodiment, the closed position refers to the position where the exhaust gas is most difficult to flow within the range of rotational displacement of valve core 19. When valve core 19 is in... Figure 2A When the closed position is shown, as Figure 2E As shown, the flow path is almost completely blocked by the upstream wall 13.

[0043] Figure 2B The diagram shows the valve core 19 in a rotated position with a 30° tilt. This tilt angle refers to the angle when the valve core 19 is projected onto a plane orthogonal to the rotation axis 11 (i.e., with...). Figure 2B (When observed from the viewpoint shown), the angle θ formed by the plane orthogonal to the flow direction of the exhaust gas and the main surface of the upstream wall 13. The main surface of the upstream wall 13 described here can be the plane assuming that the rotating end 13a, described later, does not protrude (warp). Alternatively, when the upstream wall 13 is considered to be a generally flat surface, the aforementioned main surface can also be that generally flat surface. The tilt angle is a value indicating that the valve core 19 is in a generally tilted state.

[0044] When valve core 19 is tilted, such as Figure 2F As shown, the space 5 in the flow path where the exhaust gas can move gradually increases, making it easier for the exhaust gas to flow compared to when the valve core 19 is in the closed position. Figure 2A When the device is in the closed position, the tilt angle is 0°.

[0045] Figure 2C This shows the valve core 19 in a rotated and tilted position at 60°. In this tilted state, as... Figure 2G As shown, space 5 is further enlarged, allowing the exhaust gas to flow more effectively.

[0046] Figure 2D This shows the valve core 19 in the open position. The open position refers to the position where the degree of closure is relatively small. When the valve core 19 is in the open position, it is tilted at 90°. In this tilted state, as... Figure 2H As shown, space 5 reaches its maximum, that is, the opening reaches its maximum, so that the exhaust gas flows through valve device 1 most smoothly.

[0047] The valve core 19 is capable of rotational displacement between a closed position and an open position. The valve core 19 is configured such that a stop (not shown) prevents the valve core 19 from displacing to a position other than the closed position and the open position.

[0048] like Figure 1 as well as Figure 2AAs shown, when the valve core 19 is in the aforementioned closed position, the upstream wall 13 is positioned upstream of the rotation shaft 11 in the direction of fluid flow. More precisely, the upstream wall 13 is positioned upstream of the rotation center of the rotation shaft 11. This configuration of the upstream wall 13 upstream of the rotation shaft 11 will be referred to as offset.

[0049] The end of the upstream wall 13 furthest from the rotation axis 11, and the end that moves downstream in the flow direction when the valve core 19 has shifted from the closed position to the open position, is called the rotating end 13a. The rotating end 13a is the end of the valve core 19 such that, viewed from the flow direction of the discharged gas, if the valve core 19 is divided into two regions with the rotation axis 11 as a reference, the rotating end 13a is the end of the region with the longer length from the rotation axis 11. In this case, when the valve core 19 is in the closed position, the upstream wall 13 has a shape that warps towards the upstream side of the rotating end 13a. More specifically, the portion of the upstream wall 13 closer to the rotating end 13a than the central axis 3a bends gently towards the upstream side as it approaches the rotating end 13a, and the rotating end 13a is located on the most upstream side. The portion 13b located on the opposite side of the rotating end 13a with reference to the rotation axis 11 is flat. That is, when the valve core 19 is in the closed position, the surface of this part 13b facing the upstream side is formed into a planar shape.

[0050] The upstream wall 13 is configured such that when the valve core 19 is in the closed position, the rotating end 13a and the rotating shaft 11 are in opposite positions relative to the central axis 3a.

[0051] In the following description, the direction of rotation of valve core 19 from the open position to the closed position is referred to as the closing direction, and the direction of rotation from the closed position to the open position is referred to as the opening direction. The closer to the closed position, the less open the valve device 1 becomes, thus increasing the degree of closure. In the following description, upstream and downstream refer to the upstream and downstream directions in the flow direction of the discharged gas.

[0052] The support body 15 is a container-shaped component, fixed to the downstream side of the upstream wall 13 when it is in the closed position. The rotating shaft 11 is fixed to the support body 15. The upstream wall 13 is mounted to the rotating shaft 11 via the support body 15.

[0053] The force-applying part 17 applies force to the valve core 19 in a manner that causes the valve core 19 to tend towards the closed position. The force-applying part 17 is a spring member that applies force to the valve core 19 using elasticity. The force-applying part 17 is disposed outside the pipe 3, with one end connected to a fixed part such as the side of the pipe 3, and the other end connected to the rotating shaft 11. The force-applying part 17 applies rotational force to the rotating shaft 11 in a manner that causes the valve core 19 to tend towards the closed position.

[0054] [1-2. Rotation of the valve core]

[0055] Regardless of the rotation angle of the valve core 19, the force-applying portion 17 is always stretched compared to its inherent length, thereby generating a restoring force that aims to shorten the spring member. When the valve core 19 is in the closed position, the elongation of the force-applying portion 17 is minimal, resulting in minimal restoring force. As the valve core 19 approaches the open position, the elongation of the force-applying portion 17 increases, thereby increasing the restoring force. Therefore, the restoring force of the force-applying portion 17 generates a torque that rotates the valve core 19 toward the closed position (in other words, toward the closing direction). The valve core 19 rotates toward the opening direction by means of the exhaust gas flowing through the pipe 3.

[0056] As described above, the rotating shaft 11 is positioned radially away from the central axis 3a. Therefore, if the upstream wall 13 is projected onto a plane with the central axis 3a of the pipe 3 as its normal, the area of ​​the rotating end 13a side is larger. As a result, the rotating end 13a side bears a significant rotational force from the exhaust gas, and as a whole, the valve core 19 is subjected to a rotational force that causes the rotating end 13a to tend to move rearward. When this rotational force is greater than the force applied by the force-applying part 17 in the direction of closing, the valve core 19 opens in the opening direction.

[0057] [1-3. Differences in rotational force caused by the shape of the valve core]

[0058] In the closed position, the upstream wall 13 is offset to a position upstream of the rotation axis 11, and the rotating end 13a protrudes upstream. In other words, the rotating end 13a warps upstream. The difference in rotational force resulting from this structure will be explained below.

[0059] exist Figure 3A , 3B First, the differences caused by the warping of the rotating end 13a will be explained. Here, the upstream wall 31 of the first comparative example, which is flat and has eliminated the warping, is also shown as a comparison object.

[0060] like Figure 3A As shown, in the closed position, the upstream wall 13 causes less obstruction to the flow path of the pipe 3 compared to the upstream wall 31 in the first comparative example. Therefore, in the closed position, the force exerted on the upstream wall 13 by the exhaust gas is smaller.

[0061] On the other hand, such as Figure 3B As shown, if the valve core 19 rotates in the opening direction, the rotating end 13a is located closer to the wall of pipe 3 than the end of the upstream wall 31 in the first comparative example. Therefore, compared to the upstream wall 31 in the first comparative example, the upstream wall 13 has a greater degree of obstruction of the flow path. Consequently, if the valve core 19 moves in the opening direction, the force from the exhaust gas on the upstream wall 13 is greater. Figures 4A-4DAs shown, when the tilt angle is 30° and when the tilt angle is 60°, the blockage amplitude of the upstream wall 13 on the flow path is greater than that of the upstream wall 31 in the first comparative example.

[0062] The closer the surface of the upstream wall 13 in contact with the exhaust gas is to the flow direction (the direction of the central axis 3a), the more effectively the thrust of the exhaust gas will be converted into rotational force. Figure 3A In the first comparative example, the upstream wall 13 experiences less force from the exhaust gas compared to the upstream wall 31. Figure 3B In the first comparative example, the upstream wall 13 experiences a greater force from the exhaust gas compared to the upstream wall 31. This indicates that in the closed position, the upstream wall 13 experiences a smaller force from the exhaust gas, and the force increases due to the rotation of the valve core 19.

[0063] Next, for Figure 5A , 5B The effect caused by the offset of the upstream wall 13 will be explained. Here, as a comparison, the upstream wall 41 of a second comparative example, which has the same shape as the upstream wall 13 but is not offset from the rotation axis 11, is also shown. (Refer to...) Figure 5A and Figure 5B The distances from the rotation shaft 11 to the same position on the upstream wall (the position indicated by the arrow on the upstream wall in the figure) were compared. Due to the offset of the upstream wall 13, the distance L1 of the upstream wall 13 is greater than the distance L2 of the upstream wall 41 in the second comparative example. That is, when a pushing force is applied from the exhaust gas, the distance from the point of force application to the fulcrum (rotation shaft 11) at the upstream wall 13 is larger, thereby allowing it to receive the force from the exhaust gas and apply a larger torque to the valve core. Therefore, the valve core 19 is more likely to rotate in the opening direction.

[0064] The region on the opposite side of the rotating end 13a, with reference to the rotation axis 11, in each upstream wall is called the first region 51, and the region on the side of the rotating end 13a is called the second region 53. Figure 5A As shown, when in the closed state, there is no difference between the ratio of the first region 51 to the second region 53 in the upstream wall 13 and the ratio of the first region 51 to the second region 53 in the upstream wall 41 of the second comparative example. However, as Figure 5B As shown, when the valve core 19 has rotated in the opening direction, the first region 51 of the upstream wall 13 shrinks while the second region 53 expands. The first region 51 is the portion that generates a rotational force towards the closing direction due to the exhaust gas, and the second region 53 is the portion that generates a rotational force towards the opening direction due to the exhaust gas. Therefore, when the valve core 19 has displaced in the opening direction, the upstream wall 13 can convert the force from the exhaust gas over a larger range into a rotational force tending towards the opening direction.

[0065] Even if the upstream wall 41 of the second comparative example is formed into a flat plate shape like the upstream wall 31 of the first comparative example, the above-mentioned reference will still be generated. Figure 5A , 5B This illustrates the difference in rotational force experienced by the upstream wall.

[0066] As explained above, the upstream wall 13 experiences less rotational force from the exhaust gas when it is in the closed position, while the valve core 19 experiences greater rotational force from the exhaust gas when it has rotated in the opening direction.

[0067] [1-4. Effects]

[0068] (1a) When the valve core 19 is in the closed position, the upstream wall 13 of the valve device 1 in the first embodiment is positioned upstream of the rotation center formed by the rotation shaft 11, and the upstream wall 13 has a shape in which the rotating end 13a protrudes upstream. Therefore, when the valve core 19 is in the closed position, the rotational force on the upstream wall 13 from the exhaust gas is small, and when the valve core 19 has moved from the closed position to the open position, it can effectively withstand the force from the exhaust gas. As a result, it is easy to maintain a large opening of the valve device 1, thereby enabling good control of the exhaust gas flow rate.

[0069] (1b) In valve device 1, the upstream-facing surface of portion 13b in the upstream wall 13 is planar, wherein portion 13b is the portion of the upstream wall 13 located on the opposite side of the rotating end 13a. Therefore, when the valve core 19 is in the closed position, the aforementioned portion 13b is orthogonal to the central axis 3a, and thus can effectively withstand the pressure exerted by the exhaust gas. Consequently, when the valve core 19 is in the closed position, it is possible to suppress the valve core 19 from rotating towards the open position due to a smaller exhaust gas flow.

[0070] (1c) In the valve device 1, the rotating shaft 11 is positioned radially spaced from the central axis 3a of the pipe 3. Furthermore, when the valve core 19 is in the closed position, the rotating end 13a of the upstream wall 13 and the rotating shaft 11 are positioned opposite each other with respect to the central axis 3a. Therefore, the force exerted by the exhaust gas can be reliably converted into a rotational force tending towards the opening direction.

[0071] [2. Second Implementation]

[0072] The basic structure of the second embodiment is the same as that of the first embodiment; therefore, the description of the common structures is omitted, and the description focuses on the differences. The same symbols as in the first embodiment denote the same structures, as explained above.

[0073] In the first embodiment, a structure in which a valve device 1 is installed inside the pipe 3 is illustrated. In the second embodiment, as... Figure 6 As shown, the valve device 101 is disposed inside the pipe 3 near the end 3b of the pipe 3.

[0074] In valve device 101, when valve core 19 is in the closed position, the entire upstream wall 13 is located inside pipe 3, while when valve core 19 is in the open position, a portion of the upstream wall 13 is located outside the end 3b of pipe 3. According to the structure described above, the opening degree of valve device 101 can be adjusted at the end 3b of pipe 3, thereby controlling the discharge gas flow rate.

[0075] [3. Third Implementation]

[0076] [3-1. Structure of the valve device]

[0077] In the first embodiment, a structure in which the valve device 1 is installed inside the pipe 3 is illustrated. In the third embodiment, a valve device 201 configured to block the entire end of the pipe 3 will be described.

[0078] like Figure 7A , 7B as well as Figure 8A , 8B As shown, the valve device 201 includes a valve seat 211, a valve core 213, a rotating shaft 217, a spring 219, etc. The valve seat 211 is installed in the pipe 3 and has an opening for the discharge gas to pass through. The rotating shaft 217 is connected to one end of the valve core 213. The valve core 213 can rotate about the rotating shaft 217 and closes the opening of the valve seat 211 when it approaches the valve seat 211.

[0079] Valve core 213 is configured to be able to close in a relatively closed position (refer to) with a relatively large degree of closure of pipe 3, centered on the rotation shaft 217. Figure 7A ) and the aforementioned open locations with relatively low occlusion (refer to Figure 7B , Figure 8A Rotational displacement between )

[0080] The valve core 213 includes an upstream wall 221 and a gas receiving portion 223. The upstream wall 221 is the portion that closes the opening of the valve seat 211, and the gas receiving portion 223 is disposed at the end opposite to the position where the rotation shaft 217 is located. The upstream wall 221 is the portion positioned upstream of the rotation shaft 217 in the direction of fluid flow when the valve core 213 is in the closed position. The gas receiving portion 223 is disposed on the side of the valve core 213 opposite to the rotation shaft 217. When the valve core 213 is in the closed position, the gas receiving portion 223 has a shape in which the end of the gas receiving portion 223 located on the opposite side of the rotation shaft 217 is warped towards the upstream side. The end where the gas receiving portion 223 is located is a rotating end that moves downstream in the direction of fluid flow when the valve core 213 has moved from the closed position to the open position.

[0081] The spring 219 is configured to be wound around the rotating shaft 217 and applies force to the valve core 213 in a manner that causes the valve core 213 to tend toward the position that closes the opening of the valve seat 211 (i.e., the closed position).

[0082] [3-2. Effect]

[0083] In the valve device 201 described above, when the valve core 213 is in the closed position, the upstream wall 221 is positioned upstream of the rotation center formed by the rotating shaft 217. Furthermore, the rotating end of the gas receiving portion 223 protrudes upstream. Therefore, similar to the valve device 1 described above, when the valve core 213 has moved from the closed position to the open position, it can effectively withstand the force from the discharged gas. This makes it easy to maintain a large opening degree in the valve device 201 and further reduces the exhaust pressure.

[0084] like Figure 8B As indicated by the arrow, most of the exhaust gas discharged from pipe 3 flows toward the gas receiving section 223. Therefore, the gas receiving section 223 can be subjected to a stronger pressure from the exhaust gas, thereby increasing the rotational force on the valve core 213 from the exhaust gas in the direction of opening.

[0085] [4. Other Implementation Methods]

[0086] The embodiments of this disclosure have been described above. However, this disclosure is not limited to the above embodiments, and various embodiments can be adopted within the scope of the technology to which this disclosure pertains.

[0087] (4a) The valve core of this disclosure need only have an upstream wall offset from the rotation axis and a (warped) rotating end protruding towards the upstream side; its specific shape is not particularly limited. For example, the valve core may be hollow internally. In this case, such as Figure 9As shown in valve device 301, valve core 311 can be formed as a single component. In this structure, when valve core 311 is in the closed position, the rotating end 321a in the upstream wall 321 on the upstream side can also be warped towards the upstream side. This valve core 311 can perform the same function as valve core 19 of valve device 1.

[0088] (4b) In the first embodiment, a structure is illustrated where the force-applying part 17 is disposed outside the pipe 3. However, the force-applying part may also be disposed inside the pipe 3. Figure 10 As shown in valve device 401, a force-applying part 417 can be disposed inside a hollow valve core 413. The valve core 413 has an upstream wall 415 and a rotating end 415a. In valve device 401, the force-applying part 417 is a helical spring. One end of the force-applying part 417 is connected to a rotating shaft 411, and the other end is connected to the valve core 413. The force-applying part 417 rotates and displaces with the rotation of the valve core 413. In valve device 401, the rotating shaft 411 is fixed so that it cannot rotate relative to the pipe 3. The rotating shaft 411 can be directly fixed to the pipe 3 or indirectly fixed to the pipe 3 via one or more components.

[0089] (4c) The upstream wall can be located on the upstream side of the rotation center formed by the rotation axis 11 in the direction of fluid flow, and its specific structure is not particularly limited. For example, in the first embodiment, a structure in which the upstream surface of a portion 13b of the upstream wall 13 is planar is shown. The portion 13b is the end of the upstream wall 13 located on the opposite side of the rotating end 13a. However, the upstream surface can also be curved.

[0090] (4d) In the first to third embodiments described above, a structure is shown in which the rotating shaft is positioned at a distance from the central axis 3a of the exhaust flow path. However, the rotating shaft may also be configured to intersect the central axis 3a. In this case, when the exhaust gas flows, the shape of the valve core and / or the setting of the space 5 can be adjusted to generate a torque in the valve core that tends to open.

[0091] (4e) In the first and second embodiments described above, a structure is illustrated in which the rotating end 13a curves gently upstream at the upstream wall. However, the rotating end only needs to protrude upstream when the valve core is in the closed position, and its specific shape is not particularly limited. For example Figure 11 As shown in the valve core 511 of the valve device 501, it can also be a structure in which the rotating end 513a is warped towards the upstream side by bending a portion of the upstream wall 513.

[0092] (4f) Multiple functions of one constituent element in the above embodiments can be implemented by multiple constituent elements, or one function of one constituent element can be implemented by multiple constituent elements. Furthermore, multiple functions of multiple constituent elements can be implemented by one constituent element, or one function implemented by multiple constituent elements can be implemented by one constituent element. Additionally, a portion of the configuration of the above embodiments can be omitted. The configurations of the other embodiments described above can also be added to or substituted using at least a portion of the configuration of the above embodiments.

Claims

1. A valve device, configured on a pipeline for fluid flow, characterized in that, The valve device includes: Rotation axis; A valve core, configured to rotate about the rotation axis between a closed position and an open position, wherein the closed position is a position where the valve core significantly blocks the pipe, and the open position is a position where the degree of blockage is relatively small; and A force-applying part applies force to the valve core in a manner that causes the valve core to tend toward the closed position, and The valve core has an upstream wall that, when the valve core is in the closed position, is positioned offset upstream of the direction of fluid flow from the axis of rotation. The valve core has a rotating end, which is the end of the valve core away from the axis of rotation, and is the end that moves downstream in the direction of fluid flow when the valve core has been displaced from the closed position to the open position. When the valve core is in the closed position, the rotating end has a shape that protrudes upstream. The rotating shaft is fixed to the pipe directly or indirectly in a manner that prevents it from rotating. The force-applying part is a spring member that applies force to the valve core using elasticity, and is disposed inside the valve core. One end of the force-applying part is connected to the rotating shaft, and the other end of the force-applying part is connected to the valve core.

2. The valve device according to claim 1, characterized in that, The rotating end of the valve core is located on the upstream wall. When the valve core is in the closed position, the downstream face of the upstream wall is formed as a plane, wherein the downstream face is the portion of the upstream wall located on the opposite side of the rotating end.

3. The valve device according to claim 2, characterized in that, The rotating shaft is positioned radially spaced from the central axis of the pipe. When the valve core is in the closed position, the rotating end of the upstream wall and the rotating shaft are in positions opposite to each other with respect to the central axis.

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