JP6621346B2 - Valve device - Google Patents

Description

  The present invention relates to a technology of a valve device that controls flow of fluid by rotating a valve.

  2. Description of the Related Art Conventionally, a technology of a valve device that controls the flow of fluid by rotating a valve is known. For example, as described in Patent Document 1.

  A valve device (fluid control valve) described in Patent Document 1 includes a cylindrical sheet (a housing nozzle) in which a flow path is formed, a disk-shaped valve (butterfly valve) disposed in the flow path, A seal ring fitted to the outer periphery of the valve, a shaft for supporting the valve, an actuator for rotating the valve via the shaft, and the like are provided.

  The valve device described in Patent Document 1 closes the flow path by rotating the valve so that the plate surface of the valve faces the axial direction of the seat by an actuator. At this time, the seal ring seals the gap between the seat and the valve. Further, the flow path is opened by rotating the valve closing the flow path.

  However, the seat and seal ring described in Patent Document 1 are disadvantageous in that they are easily worn by sliding when the valve rotates.

Japanese Patent No. 4793290

  The present invention has been made in view of the above circumstances, and a problem to be solved is to provide a valve device capable of suppressing wear of a seat and a seal ring.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, in claim 1, a sheet having a flow passage formed therethrough, a valve that is rotatably disposed in the flow passage, and that opens and closes the flow passage, and an outer periphery of the valve A seal ring fitted to the valve, and a diameter expanding means for expanding the diameter of the seal ring and sealing a gap between the seat and the seal ring when the valve is rotated to a position where the flow path is closed. The seal ring includes a joint that is a cut portion, and the diameter expanding means expands the diameter of the seal ring by expanding the joint .

According to a second aspect of the present invention, the diameter-expanding means pushes and widens the joint by entering the joint when the valve is rotated to a position where the valve is closed .

According to a third aspect of the present invention, the diameter expanding means is fixed to the sheet .

According to a fourth aspect of the present invention, the abutment is arranged at a position separated from the rotation axis of the valve .

According to a fifth aspect of the present invention, the diameter increasing means is constituted by a member different from the sheet .

According to a sixth aspect of the present invention, tension in the diameter reducing direction acts on the seal ring .

  As effects of the present invention, the following effects can be obtained.

According to the first aspect, wear of the seat and the seal ring can be suppressed. Further, the diameter of the seal ring can be easily increased.

  According to the second aspect, the diameter of the seal ring can be easily increased.

In Claim 3, the structure of a diameter expansion means can be simplified .

According to the fourth aspect, the wear of the seat and the seal ring can be effectively suppressed .

In the fifth aspect, the diameter expanding means can be easily provided .

According to the sixth aspect, it is possible to suppress the occurrence of malfunction .

The front sectional view showing the valve device concerning one embodiment of the present invention. (A) The expanded side view which showed the valve | bulb and the seal ring. (B) A1-A1 sectional drawing. The enlarged side view which showed a mode that a seal ring approached a notch pin. (A) The expanded side view which showed a mode that a seal ring and a notch pin contact | abut. (B) Similarly, an enlarged front sectional view. (A) The enlarged side view which showed a mode that an opening is expanded. (B) Similarly, an enlarged front sectional view. Front sectional drawing which showed the state which obstruct | occluded the flow path completely. (A) Front sectional drawing which showed the valve apparatus which concerns on a 1st modification. (B) Front sectional drawing which showed the state which closed the flow path completely with the valve apparatus which concerns on a 1st modification. (A) The expanded side view which showed the valve | bulb and seal ring which concern on a 2nd modification. (B) A2-A2 sectional drawing. (A) The expanded side view which showed a mode that an opening was expanded with the notch pin which concerns on a 2nd modification. (B) Similarly, an enlarged front sectional view.

  In the following, the directions indicated by arrow U, arrow D, arrow F, arrow B, arrow L and arrow R in the figure are defined as upward, downward, forward, backward, leftward and rightward, respectively. To explain.

  Below, with reference to FIG.1 and FIG.2, the structure of the valve apparatus 10 which concerns on one Embodiment of this invention is demonstrated. In the drawings attached to the present specification, in order to make the configuration and operation of the valve device 10 easier to understand, the dimensions of each member, the gaps between the members, and the like are exaggerated.

  The valve device 10 is for controlling the flow of fluid. In addition, the valve apparatus 10 which concerns on this embodiment shall be provided in an exhaust-gas recirculation (EGR) apparatus of an engine. As shown in FIG. 1, the valve device 10 includes a seat 20, a valve 30, a seal ring 40, a shaft 50, a notch pin 60, and the like.

  The sheet 20 forms a fluid flow path (exhaust gas in the present embodiment). The seat 20 is formed in a substantially cylindrical shape with its axial direction directed in the front-rear direction. The seat 20 according to the present embodiment is provided in a passage that connects the intake passage and the exhaust passage of the engine. The sheet 20 includes a flow path 21 and a support hole 22.

  The channel 21 is a passage through which fluid flows. The channel 21 is formed in a substantially circular shape when viewed from the front, and penetrates the sheet 20 in the axial direction (front-rear direction).

  The support hole 22 is a hole that supports a notch pin 60 described later. The support hole 22 penetrates the sheet 20 in the radial direction from the outer peripheral surface to the inner peripheral surface. The support hole 22 is formed at the right end portion of the sheet 20.

  The valve 30 is a substantially disk-shaped member for opening and closing the flow path 21. The valve 30 is formed so that its outer diameter is smaller than the inner diameter of the seat 20. The valve 30 is rotatably supported by the seat 20 via a shaft 50 described later. As a result, the valve 30 is disposed in the flow path 21 with a gap between the seat 20 and the inner peripheral surface (wall surface of the flow path 21). As shown in FIG. 2, the valve 30 includes a seal ring groove 31.

  The seal ring groove 31 is a groove formed on the outer peripheral surface of the valve 30. The seal ring groove 31 is formed so as to extend in the circumferential direction of the valve 30, and is formed over the entire circumference of the valve 30. The seal ring groove 31 is formed at the center in the thickness direction of the valve 30 and has side walls on the front and rear sides.

  The valve 30 configured as described above opens the flow path 21 when the state shown in FIG. 1, that is, when the plate surface faces a direction different from the axial direction of the seat 20. Further, the valve 30 completely opens the flow path 21 when the plate surface faces a direction (left-right direction) orthogonal to the axial direction of the seat 20. Further, the valve 30 completely closes the flow path 21 when the plate surface faces the axial direction of the seat 20 (see FIG. 6). Hereinafter, such a position where the valve 30 completely closes the flow path 21 (position shown in FIG. 6) is referred to as a “fully closed position”.

  The seal ring 40 shown in FIGS. 1 and 2 is for sealing the gap between the seat 20 and the valve 30. The seal ring 40 is formed in a substantially C shape when viewed from the front, with its right end cut out. The seal ring 40 is made of an elastic material. The seal ring 40 is formed so that its outer diameter is larger than the outer diameter of the valve 30 and slightly smaller than the inner diameter of the seat 20. The seal ring 40 includes a joint 41.

  The joint 41 is a cut portion (a gap along the circumferential direction of the seal ring 40) formed at the right end of the seal ring 40.

  The seal ring 40 is fitted in the seal ring groove 31. Thereby, the outer peripheral surface of the seal ring 40 protrudes radially outward from the outer peripheral surface of the valve 30. The seal ring 40 is supported by the side wall of the seal ring groove 31 so as to rotate integrally with the valve 30 and to restrict relative movement of the valve 30 in the thickness direction.

  A tension in the direction of diameter reduction acts on the seal ring 40. That is, the seal ring 40 is constantly shrinking, and the inner peripheral surface thereof contacts the bottom surface of the seal ring groove 31 to press the valve 30 radially inward. According to this, the relative rotation of the seal ring 40 with respect to the valve 30 can be suppressed.

  As shown in FIG. 1, the shaft 50 is a substantially columnar member for supporting the valve 30 in a rotatable manner. The shaft 50 is fixed to the rear surface of the valve 30 with the axial direction thereof being directed in the vertical direction. The upper end of the shaft 50 protrudes from the seat 20 and is connected to a drive source such as a motor (not shown). The shaft 50 receives power from the drive source and rotates relative to the seat 20. As a result, the shaft 50 rotates the valve 30 around the axis L1.

  The notch pin 60 is a substantially cylindrical member for expanding the diameter of the seal ring 40. The notch pin 60 is formed so that its outer diameter is larger than the distance along the vertical direction of the joint 41 of the seal ring 40.

  The notch pin 60 is fixed to the sheet 20 by being press-fitted into the support hole 22 of the sheet 20. As a result, the notch pin 60 is arranged with the position in the circumferential direction of the seat 20 aligned with the joint 41 of the seal ring 40. The left end of the notch pin 60 protrudes leftward from the inner peripheral surface of the sheet 20 (side wall of the flow path 21). The protruding portion of the notch pin 60 protrudes from the seat 20 by a width corresponding to the distance along the radial direction from the outer peripheral surface of the valve 30 rotated to the fully closed position to the inner peripheral surface of the seat 20 (see FIG. 6). ). Thereby, the notch pin 60 is configured so as not to collide with the valve 30 even when the valve 30 is rotated to the fully closed position.

  Next, the closing operation of the valve device 10 will be described with reference to FIGS. In addition, the arrow shown in white in FIG. 3 and FIG. Further, the arrows shown in black in FIG. 5 indicate that the seal ring 40 is elastically deformed.

  First, the valve device 10 shown in FIGS. 1 and 2 transmits the power from the drive source to the shaft 50 to rotate the valve 30 and the seal ring 40 in the direction of the arrow shown in FIG. Thereby, the valve 30 is rotated so that the plate surface of the valve 30 faces the axial direction of the seat 20 (so that the opening degree becomes small). At this time, as shown in FIGS. 1 and 3, the joint 41 of the seal ring 40 approaches the notch pin 60.

  As described above, since the outer diameter of the seal ring 40 is smaller than the inner diameter of the sheet 20, the seal ring 40 rotates with a gap formed between the seal ring 40 and the inner peripheral surface of the sheet 20 (wall surface of the flow path 21). That is, the seal ring 40 does not slide with respect to the seat 20 even if it rotates from the state shown in FIG.

  As shown in FIG. 4, when the valve 30 rotates just before the fully closed position, the joint 41 of the seal ring 40 tries to pass through the notch pin 60. As described above, the outer diameter of the notch pin 60 is larger than the distance along the vertical direction of the joint 41. For this reason, the notch pin 60 comes into contact with the upper and lower end portions (both end portions in the circumferential direction of the seal ring 40) of the joint portion 41 so as to enter the joint portion 41.

  As shown in FIGS. 5 and 6, when the valve 30 further rotates from the state in which the seal ring 40 and the notch pin 60 are in contact with each other, the notch pin 60 enters the joint 41 while pushing the joint 41 of the seal ring 40 wide. As a result, the notch pin 60 uniformly expands the diameter of the seal ring 40.

  When the valve 30 is rotated to the fully closed position shown in FIGS. 5 and 6, the notch pin 60 enters the joint 41 until the axial center thereof is disposed at the front and rear central portions of the joint 41 of the seal ring 40. At this time, the top portion (upper end portion) and the bottom portion (lower end portion) of the notch pin 60 come into contact with both end surfaces of the seal ring 40. Thus, the diameter of the seal ring 40 is increased by a length corresponding to the outer diameter of the notch pin 60, and the entire outer peripheral surface thereof is in close contact with the inner peripheral surface of the sheet 20 (the wall surface of the flow path 21). Thereby, when the valve 30 closes the flow path 21, the gap between the outer peripheral surface of the valve 30 and the inner peripheral surface of the seat 20 can be sealed with the seal ring 40.

  When opening the flow path 21, the valve device 10 rotates the valve 30 in the direction opposite to the case where the flow path 21 is closed (the direction opposite to the arrow direction shown in FIG. 1). Accordingly, the joint 41 of the seal ring 40 moves rearward and is separated from the notch pin 60. At this time, the notch pin 60 comes out of the joint 41 immediately after the rotation of the valve 30 starts (when the valve 30 slightly rotates from the fully closed position). As a result, the seal ring 40 is reduced in diameter and does not adhere to the inner peripheral surface of the sheet 20. Thereafter, even if the valve 30 rotates until the flow path 21 is completely opened, the seal ring 40 does not slide with respect to the inner peripheral surface of the seat 20.

  As described above, when the valve 30 is in the rotational position that is very close to the fully closed position, the valve device 10 is slightly moved from just before the fully closed position to the fully closed position and slightly from the fully closed position. The seal ring 40 is expanded in diameter by the notch pin 60 and is brought into close contact with the inner peripheral surface of the sheet 20 only until it is rotated. According to this, the seal ring 40 can be prevented from sliding with respect to the seat 20 unless the flow path 21 is completely closed or the completely closed flow path 21 is opened. For this reason, abrasion of the seat 20 and the seal ring 40 can be suppressed, and leakage of exhaust gas due to wear of the seat 20 and the seal ring 40 can be suppressed.

  As described above, the valve device 10 according to the present embodiment is disposed so as to be freely rotatable in the flow path 21 and the seat 20 through which the flow path 21 is formed. When the valve 30 is turned to a fully closed position (a position where the valve 30 closes the flow path 21), the seal ring 40 is opened. And a notch pin 60 (diameter expanding means) that expands the diameter and seals the gap between the seat 20 and the seal ring 40.

  By comprising in this way, abrasion of the sheet | seat 20 and the seal ring 40 can be suppressed.

  In addition, the seal ring 40 includes a joint 41 that is a cut portion, and the notch pin 60 expands the diameter of the seal ring 40 by pushing and widening the joint 41.

By configuring in this way, the seal ring 40 is made to be larger than the case of expanding the diameter of the seal ring 40 by pushing the inner peripheral surface of the seal ring 40 radially outward from the seal ring groove 31 as described later. The diameter can be easily expanded.
Further, since the diameter of the seal ring 40 can be expanded uniformly, the entire outer peripheral surface of the seal ring 40 can be easily adhered to the inner peripheral surface of the sheet 20. Thereby, sealing performance can be improved.

  In addition, the notch pin 60 extends the joint 41 by entering the joint 41 when rotated to the fully closed position.

  By comprising in this way, the diameter of the seal ring 40 can be expanded easily compared with the case where compressed air etc. are sprayed to the abutment 41 which is mentioned later, and diameter is expanded.

  The notch pin 60 is fixed to the sheet 20.

  With this configuration, it is possible to expand the diameter of the seal ring 40 without using a drive source or the like for moving a notch pin (notch pin 160 according to the first modification shown in FIG. 7) as will be described later. Therefore, the configuration for expanding the diameter of the seal ring 40 can be simplified.

Further, the joint 41 is arranged at a position away from the rotation axis of the valve 30 (the axis L1 of the shaft 50).
The abutment 41 according to the present embodiment is disposed at the farthest position with respect to the right end portion of the valve 30, that is, the rotation axis of the valve 30.

  By configuring in this way, the moving distance of the abutment 41 with respect to the rotation angle of the valve 30 can be increased. As a result, the notch pin 60 can be inserted into and withdrawn from the abutment 41 by slightly rotating the valve 30. Therefore, the diameter of the seal ring 40 is increased only when the valve 30 is in a rotational position very close to the fully closed position. It becomes possible to make it. According to this, the diameter of the seal ring 40 can be increased only when necessary, and the seal ring 40 can be prevented from sliding with respect to the seat 20 as much as possible. Therefore, wear of the seat 20 and the seal ring 40 can be effectively suppressed.

  Further, the notch pin 60 is constituted by a member different from the sheet 20.

By configuring in this way, the sheet 20 and the notch pin 60 can be formed by simple processing as compared with the case where the notch pin 60 is integrally formed on the sheet 20, and thus the notch pin 60 is simply provided on the sheet 20. be able to.
Moreover, the notch pin 60 can be easily provided (retrofitted) on the existing valve device.

  The seal ring 40 is subjected to tension in the direction of diameter reduction.

  By comprising in this way, the relative rotation with respect to the valve | bulb 30 of the seal ring 40 can be suppressed. According to this, since it can suppress that the abutment 41 slip | deviates to the circumferential direction of the seal ring 40 with respect to the notch pin 60, it can make it easy to enter the notch pin 60 in the abutment 41. Thereby, it is possible to suppress the occurrence of malfunction due to the relative rotation of the seal ring 40 with respect to the valve 30.

  The notch pin 60 according to this embodiment is an embodiment of the diameter expanding means according to the present invention.

  The embodiment of the present invention has been described above, but the present invention is not limited to the above-described configuration, and various modifications can be made within the scope of the invention described in the claims.

  For example, although the valve device 10 according to the present embodiment is provided in the EGR device, the application target of the valve device 10 is not limited to this.

  In addition, the exhaust gas is assumed to flow through the flow path 21 according to the present embodiment, but the fluid flowing through the flow path 21 is not limited to the exhaust gas, and may be compressed air, for example. Also good. Moreover, the fluid which distribute | circulates the flow path 21 is not limited to gas, For example, liquids, such as water, may be sufficient.

  Moreover, in this embodiment, although the diameter of the seal ring 40 was expanded by pushing and widening the abutment 41, it is not necessary to expand the diameter of the seal ring 40 by pushing and widening the abutment 41. For example, the diameter of the seal ring 40 may be increased by pushing the inner peripheral surface of the seal ring 40 radially outward from the seal ring groove 31 with a shaft member capable of expanding the diameter, compressed air, or the like.

  Further, the notch pin 60 does not necessarily have to enter the joint 41. For example, the joint 41 may be expanded by spraying compressed air or the like onto the joint 41.

  In addition, the notch pin 60 according to the present embodiment is fixed to the sheet 20, but is not limited thereto, and may be supported by the sheet 20 so as to be relatively movable. In such a case, for example, the notch pin 60 may be configured as the notch pin 160 of the valve device 110 according to the first modification shown in FIG.

The notch pin 160 according to the first modification is supported by the support hole 22 of the seat 20 so as to be movable in the left-right direction by a drive source. As shown in FIG. 7, the notch pin 160 is moved to the left after the valve 30 has been rotated to the fully closed position, enters the abutment 41, pushes and widens the abutment 41, and expands the diameter of the seal ring 40. Further, the notch pin 160 is moved to the right and exits from the joint 41 when opening the flow path 21. Thereafter, the valve 30 is rotated. By comprising in this way, since it can prevent that the sheet | seat 20 and the seal ring 40 slide, the abrasion of the sheet | seat 20 and the seal ring 40 can be suppressed effectively.
The valve device 110 according to such a first modification may move the notch pin 160 in the left-right direction by a mechanism that interlocks with the rotation of the valve 30.

  In addition, the notch pin 60 according to the present embodiment is arranged such that when the valve 30 is rotated to the fully closed position, the axial center thereof is disposed at the front and rear central portions of the joint 41, but is not limited thereto. Absent. For example, when the valve 30 is rotated to the fully closed position, the notch pin 60 may be arranged such that its axial center is located at the front part of the joint 41 (frontward of the front and rear center part). In such a case, the notch pin 60 may be in contact with corner portions (the front upper end portion and the front lower end portion of the joint 41) instead of the both end faces of the seal ring 40.

  In addition, the notch pin 60 according to the present embodiment is configured by a member different from the sheet 20, but is not limited thereto, and may be formed integrally with the sheet 20. .

  The member to which the notch pin 60 is fixed is not limited to the sheet 20 as in the present embodiment, and may be fixed to another member.

  Further, the seal ring 40 according to the present embodiment is assumed to be subjected to the radially inward tension, but is not limited to this, and may be, for example, one in which no tension acts.

  Moreover, the seal ring 40 does not ask | require the presence or absence of the abutment 41. For example, the seal ring 40 may not be provided with the joint 41, that is, may be constituted by an elastic member such as an annular rubber.

  Further, the outer diameter of the seal ring 40 according to the present embodiment is formed so as to be smaller than the inner diameter of the sheet 20, but is not limited thereto, and is substantially the same as the inner diameter of the sheet 20. You may form so that it may become a magnitude | size. In this case, since the seal ring 40 comes into contact with the sheet 20 with a weaker force than that at the time of diameter expansion in a state before the diameter expansion by the notch pin 60, wear due to sliding with the sheet 20 can be suppressed. .

  Moreover, although the abutment 41 which concerns on this embodiment shall be arrange | positioned at the right end part of the valve | bulb 30, the position with respect to the valve | bulb 30 of the abutment 41 is not limited to this. The abutment 41 may be arranged at the left end of the valve 30, for example. Even in such a case, the abutment 41 can be disposed at a position farthest from the rotation axis of the valve 30.

  Further, the abutment 41 is not necessarily arranged at a position farthest from the rotation axis of the valve 30. The abutment 41 only needs to be arranged at a position away from the rotation axis of the valve 30 so that the notch pin 60 enters and exits during the rotation of the valve 30. The abutment 41 may be disposed, for example, in the lower left portion, upper left portion, lower right portion, and upper right portion of the valve 30. The position where such a joint 41 is arranged is included in “a position away from the rotation axis of the valve”.

  In addition, the valve 30 according to the present embodiment closes the flow path 21 by rotating in the arrow direction shown in FIG. 1, but the rotation direction of the valve 30 is not limited to this. . For example, the valve 30 may close the flow path 21 by rotating in a direction opposite to the arrow direction shown in FIG.

  Further, the configuration of the valve 30 is not limited to the present embodiment, and for example, a configuration like the valve 230 of the valve device 210 according to the second modification shown in FIGS. 8 and 9 may be employed. is there.

The valve 230 according to the second modification includes a seal ring groove 231 and a groove portion 232. The seal ring groove 231 is formed over the entire outer peripheral surface of the valve 230 except for the right end portion of the valve 230. The groove 232 is formed at the right end of the valve 230 and communicates with the seal ring groove 231. The groove 232 is formed from the front side surface to the rear side surface of the valve 230. An abutment 41 of the seal ring 40 is disposed inside the groove portion 232. Further, as shown in FIG. 9, the notch pin 260 according to the second modification is formed such that its length (width in the axial direction) is longer than the depth of the groove portion 232 than the notch pin 60 according to the present embodiment. The
With this configuration, the notch pin 260 can be inserted into the groove portion 232 of the valve 230 when the valve 230 is rotated, and the notch pin 260 can be abutted from the left end portion to the right end portion of the joint 41. It becomes. According to this, the contact range of the notch pin 260 and the seal ring 40 can be widened, and the notch pin 260 can be easily inserted into the joint 41 of the seal ring 40.

DESCRIPTION OF SYMBOLS 10 Valve apparatus 20 Seat 21 Flow path 30 Valve 40 Seal ring 60 Notch pin (diameter expansion means)

Claims (6)

A sheet having a flow passage formed therethrough;
A valve that is rotatably arranged in the flow path, and that opens and closes the flow path by rotating,
A seal ring fitted to the outer periphery of the valve;
A diameter expanding means for expanding the diameter of the seal ring and sealing a gap between the seat and the seal ring when the valve rotates to a position closing the flow path;
Equipped with,
The seal ring has a joint that is a cut portion,
The diameter-expanding means expands the diameter of the seal ring by expanding the joint.
Valve device. The diameter-expanding means pushes the abutment by entering the abutment when the valve rotates to a position to close the flow path,
The valve device according to claim 1. The diameter expanding means is fixed to the sheet,
The valve device according to claim 1 or 2. The joint is disposed at a position away from the rotation axis of the valve.
The valve device according to any one of claims 1 to 3 . The diameter expanding means is constituted by a member different from the sheet,
Valve device according to any one of claims 1 to 4. A tension in the direction of diameter reduction is acting on the seal ring.
The valve device according to any one of claims 1 to 5.

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