JP2016161005A - Channel on-off valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a channel on-off valve which enables reduction of load torque when opening or closing and also enables locking.SOLUTION: A channel on-off valve 10 includes: a valve housing 30; a valve body 40 which may rotate with a shaft 50; a first driving mechanism 60 which rotates the shaft 50; a sealing ring 70 on which the valve body 40 is seated; a seal ring moving mechanism 80 which moves the seal ring 70; and a lock mechanism 90 which blocks rotation of the valve body 40. The lock mechanism 90 includes: a first engagement part provided in the seal ring 70 or the seal ring moving mechanism 80; and a second engagement part provided in the valve body 40.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a flow path opening / closing valve, and more particularly to a flow path opening / closing valve including a lock mechanism.

  A ball valve may be used as the flow path opening / closing valve. The valve body of the ball valve is seated on the seal ring when the ball valve is closed. When the ball valve is opened and closed, a relatively large load torque is generated because the seal ring rubs against the ball valve body.

  As a related technique, Patent Document 1 describes a flow path opening / closing valve. In the flow path opening / closing valve described in Patent Document 1, the center of curvature of the valve body of the ball valve is disposed at a position off the axis of the shaft that rotates the valve body of the ball valve. And the load torque at the time of opening / closing operation | movement of a ball valve is reduced by the said arrangement | positioning.

Japanese Patent No. 5615117

  An object of the present invention is to provide a flow path opening / closing valve capable of reducing the load torque during the opening / closing operation of the flow path opening / closing valve and locking the flow path opening / closing valve.

  These objects and other objects and benefits of the present invention can be easily confirmed by the following description and the accompanying drawings.

  Hereinafter, means for solving the problem will be described using the numbers and symbols used in the embodiments for carrying out the invention. These numbers and symbols are added with parentheses for reference in order to show an example of the correspondence between the description of the claims and the mode for carrying out the invention. Accordingly, the claims should not be construed as limiting due to the bracketed description.

  The flow path opening / closing valve of some embodiments includes a valve housing (30) having a flow path (20), a valve body (40) disposed in the flow path (20), and rotatable with a shaft (50). A first drive mechanism (60) for rotating the shaft (50), a seal ring (70) disposed in the flow path (20) and on which the valve body (40) is seated, and the seal ring (70) A seal ring moving mechanism (80) for moving the valve body between a first position (P1) capable of contacting the valve body (40) and a second position (P2) spaced from the valve body (40), And a locking mechanism (90) for preventing the rotation of the valve body (40). The lock mechanism (90) includes a first engagement portion (94) provided in the seal ring (70) or the seal ring moving mechanism (80) and a second engagement portion provided in the valve body (40). (95).

  In the flow path opening / closing valve, the valve body (40) may include a spherical surface portion (40a) seated on the seal ring (70).

  In the flow path opening / closing valve, the first engagement portion (94) includes an upper first engagement portion (94a) disposed apart from each other along a direction parallel to the longitudinal direction of the shaft (50). A lower first engaging portion (94b) may be provided.

  In the channel opening / closing valve, an imaginary straight line (L) connecting the upper first engagement portion (94a) and the lower engagement portion (94b) is a cross section perpendicular to the longitudinal direction of the channel (20). You may make it pass the center part of the said flow path (20).

  In the flow path opening / closing valve, the center of curvature (A2) of the spherical shape portion (40a) may not be on the rotation axis (A1) of the shaft (50).

  In the flow path opening / closing valve, the seal ring moving mechanism (80) is movable relative to the valve housing (30), and is capable of engaging with the seal ring (70). A second drive mechanism (82) for moving the moving member (84) may be provided.

  In the flow path opening / closing valve, the first engagement portion (94) may be provided on the moving member (84).

  In the flow path opening / closing valve, the moving member (84) includes a moving member main body (84A) moved by the second drive mechanism (82) and a slider relatively movable with respect to the moving member main body (84A). (84B) and a first elastic member (84C) disposed between the moving member main body (84A) and the slider (84B).

  In the flow path opening / closing valve, the seal ring moving mechanism (80) includes a second elastic member (84D) disposed between the valve housing (30) and the slider (84B), and the second elastic member. The elastic modulus of the member (84D) may be larger than the elastic modulus of the first elastic member (84C).

  The flow path opening / closing valve may include a shim member (200) disposed between the moving member (84) and the valve housing (30).

  In the flow path opening / closing valve, the surface (96a) facing the valve body (40) among the surfaces of the projecting portion (96) including the first engaging portion (94) has a constant inclination angle or an inclination angle. It may be a continuously changing surface.

  According to the present invention, it is possible to provide a flow path opening / closing valve capable of reducing the load torque during the opening / closing operation of the flow path opening / closing valve and locking the flow path opening / closing valve.

FIG. 1A is a schematic cross-sectional view schematically showing a flow path opening / closing valve, and shows a closed state of the flow path opening / closing valve. FIG. 1B is a schematic cross-sectional view schematically showing the flow path opening / closing valve, and is a view showing an open state of the flow path opening / closing valve. FIG. 2 is a schematic cross-sectional view schematically showing the flow path opening / closing valve. FIG. 3A is an enlarged view of a region B surrounded by a two-dot chain line in FIG. 2, and shows a locked state by a locking mechanism. FIG. 3B is an enlarged view of a region B surrounded by a two-dot chain line in FIG. 2 and shows a state where the lock by the lock mechanism 90 is released. FIG. 3C is a CC arrow view of the valve body shown in FIG. 3B. 3D is a CC arrow view of the valve body (modified example) shown in FIG. 3B. 3E is a cross-sectional view taken along the line GG in FIG. 3D. FIG. 4 is a schematic cross-sectional view showing a modification of the lock mechanism. FIG. 5 is a schematic cross-sectional view schematically showing the flow path opening / closing valve. FIG. 6A is a schematic perspective view (partially cutaway perspective view) schematically showing a flow path opening / closing valve. FIG. 6B is a schematic perspective view (partially cutaway perspective view) schematically showing the flow path opening / closing valve. FIG. 7A is an enlarged view of a region D surrounded by a two-dot chain line in FIG. 5, and shows a state in which the seal ring is in contact with the valve body and the valve body is locked by the lock mechanism. FIG. 7B is an enlarged view of a region D surrounded by a two-dot chain line in FIG. 5, and shows a state where the seal ring is in contact with the valve body and the valve body is unlocked. FIG. 7C is an enlarged view of a region D surrounded by a two-dot chain line in FIG. 5 and shows a state in which the seal ring is separated from the valve body and the valve body is unlocked. FIG. 7D is an enlarged view of a region D surrounded by a two-dot chain line in FIG. 5, and shows a state where the seal ring is in contact with the valve body and the valve body is locked by the lock mechanism. FIG. 8A is a schematic plan view illustrating an example of a first engagement portion and a second engagement portion. FIG. 8B is a schematic side view showing an example of the first engagement portion. FIG. 8C is a schematic plan view illustrating an example of the first engagement portion and the second engagement portion. FIG. 8D is a schematic plan view illustrating an example of the first engagement portion and the second engagement portion.

  Hereinafter, the flow path opening / closing valve will be described with reference to the accompanying drawings.

(Definition of coordinate system)
In this specification, the axis parallel to the fluid flow at the inlet portion of the flow path opening / closing valve is the X axis, and the direction parallel to the axis of the shaft that rotates the valve body of the flow path opening / closing valve is the Z axis, X axis, and Z axis. The axis orthogonal to is defined as the Y axis.

(Problems recognized by the inventor)
The problem recognized by the inventor will be described with reference to FIGS. 1A and 1B. FIG. 1A is a schematic cross-sectional view schematically showing the flow path opening / closing valve 1, and shows a closed state of the flow path opening / closing valve 1. FIG. 1B is a schematic cross-sectional view schematically showing the flow path opening / closing valve 1, and is a view showing an open state of the flow path opening / closing valve 1.

  As shown in FIG. 1A, the flow path opening / closing valve 1 includes a valve housing 3, a valve body 4 (ball valve body), and a seal ring 7. The valve housing 3 has a flow path 2. The valve body 4 is disposed in the flow path 2 and is rotatable around the rotation axis A1. The seal ring 7 is disposed in the flow path 2. When the flow path opening / closing valve 1 is closed, the valve element 4 is seated on the seal ring 7. In FIG. 1A, an arrow F indicates the flow direction of the fluid at the inlet portion of the flow path opening / closing valve 1. The direction indicated by the arrow F coincides with the positive direction of the X axis.

  The valve body 4 shown in FIG. 1A has a spherically shaped portion 4a that sits on the seal ring 7 when the flow path opening / closing valve 1 is closed. The center of curvature A2 of the spherical shape portion 4a is not on the rotation axis A1. In other words, the center of curvature A2 of the spherical shape portion 4a is at a position eccentric from the rotation axis A1.

  In the example described in FIGS. 1A and 1B, the center of curvature A2 of the spherical shape portion 4a is not on the rotation axis A1. For this reason, when the valve body 4 rotates around the rotation axis A <b> 1 (in other words, when the flow path opening / closing valve 1 opens), the valve body 4 is separated from the seal ring 7. By separating the valve body 4 from the seal ring 7, the valve body 4 can be rotated with a smaller torque. In other words, by separating the valve body 4 from the seal ring 7, it is possible to reduce the load torque during the opening / closing operation of the flow path opening / closing valve 1.

  Assume that the power supply for operating the flow path opening / closing valve 1 is OFF and the fluid pressure is acting on the flow path opening / closing valve 1 (valve element 4). The reason why the power is turned off is, for example, for transportation of a system including the flow path opening / closing valve 1, for power saving, or for failure of the flow path opening / closing valve 1. In the example described in FIGS. 1A and 1B, the center of curvature A2 of the spherical shape portion 4a is not on the rotation axis A1. For this reason, when fluid pressure acts on the valve body 4 in the direction indicated by the arrow F, the valve body 4 rotates and moves in the opening direction. That is, in the flow path opening / closing valve 1 described in FIGS. 1A and 1B, the flow of fluid cannot be blocked when the power source for operating the flow path opening / closing valve 1 is OFF.

  Note that the examples described in FIGS. 1A and 1B are examples in which the center of curvature A2 of the spherical shape portion 4a is not on the rotation axis A1. However, even when the center of curvature A2 of the spherical shape portion 4a is on the rotation axis A1, a situation occurs in which the valve body 4 moves due to vibration or the like when the power supply for operating the flow path opening / closing valve 1 is OFF. Can do.

  1A and 1B are diagrams used for convenience in order to explain the problems recognized by the inventor, and do not indicate a known technique prior to the filing of the present application.

(Overview of flow path opening / closing valve)
With reference to FIG. 2 thru | or FIG. 3C, the flow-path on-off valve by embodiment is demonstrated. FIG. 2 is a schematic cross-sectional view schematically showing the flow path opening / closing valve 10.

  As shown in FIG. 2, the flow path opening / closing valve 10 includes a valve housing 30, a valve body 40 (ball valve body), a shaft 50, a first drive mechanism 60 that rotates the shaft, a seal ring 70, A seal ring moving mechanism 80 and a lock mechanism 90 are provided.

  The valve housing 30 has a flow path 20 in which the valve body 40 is disposed. The flow path 20 includes an upstream flow path 20 </ b> A located on the upstream side of the valve body 40 and a downstream flow path 20 </ b> B located on the downstream side of the valve body 40. In FIG. 2, an arrow F indicates the flow direction of the fluid at the inlet portion of the flow path opening / closing valve 1. The direction indicated by the arrow F coincides with the positive direction of the X axis.

  The valve body 40 is disposed in the flow path 20 and can rotate around the rotation axis A <b> 1 together with the shaft 50. The shaft 50 and the valve body 40 may be fixed to each other. Alternatively, the shaft 50 and the valve body 40 may be integrally formed members.

  The valve body 40 may be provided with a valve body flow path 42. When the valve body 40 is in the closed position, the valve body flow path 42 is inconsistent with the flow path 20 (in other words, the valve body flow path 42 is the upstream flow path 20A or the downstream flow path 20B. Not in fluid communication with at least one of these). When the valve body 40 is in the open position, the valve body flow path 42 is aligned with the flow path 20 (in other words, the valve body flow path 42 is in fluid communication with the upstream flow path 20A and the downstream flow path 20B. .)

  The valve body 40 includes a spherically shaped portion 40 a that is seated on the seal ring 70 when the flow path opening / closing valve 10 is closed. The center of curvature A2 of the spherical shape portion 40a may be on the rotation axis A1 of the shaft 50. Alternatively, the center of curvature A2 of the spherical shape portion 40a may not be on the rotation axis A1 of the shaft 50.

  The first drive mechanism 60 can rotate the shaft 50 using power from a drive source such as a motor. As the shaft 50 rotates, the valve body 40 rotates between the closed position and the open position. FIG. 2 shows a state where the valve body 40 is in the closed position.

  The seal ring 70 is disposed in the flow path 20. At least when the flow path opening / closing valve 10 is closed, the valve body 40 is seated on the seal ring 70. The material of the seal ring is, for example, ethylene trifluoride (PCTFC). Trifluoroethylene has higher hardness than polytetrafluoroethylene. Since ethylene trifluoride can be used even at extremely low temperatures, it is suitable when the fluid flowing through the flow path 20 is a cryogenic fluid (for example, liquid hydrogen, liquid oxygen, liquid nitrogen, etc.).

  The seal ring moving mechanism 80 moves the seal ring 70. The seal ring moving mechanism 80 moves the seal ring 70 along the X-axis direction (in other words, along the direction perpendicular to the rotation axis A1 of the shaft 50). The seal ring moving mechanism 80 moves the seal ring 70 between a first position P1 that can contact the valve body 40 and a second position P2 that is separated from the valve body 40. FIG. 2 shows a state where the seal ring 70 is in the first position P1.

  The seal ring moving mechanism 80 may be any mechanism as long as it moves the seal ring 70. In the example illustrated in FIG. 2, the seal ring moving mechanism 80 includes a solenoid 82, a moving member 84 (for example, an armature), and an elastic member 86 (for example, a coil spring). Due to the current flowing through the solenoid 82, the moving member 84 moves in the positive direction of the X axis or in the negative direction of the X axis. That is, the solenoid 82 constitutes a second drive mechanism that moves the moving member 84 relative to the valve housing 30. When no current flows through the solenoid 82, the moving member 84 is urged toward the positive X-axis by the elastic member 86. In other words, when no current flows through the solenoid 82, the seal ring 70 is biased toward the valve body 40.

  The lock mechanism 90 is a mechanism that prevents the valve body 40 from rotating. The lock mechanism 90 will be described with reference to FIGS. 3A to 3C. 3A is an enlarged view of a region B surrounded by a two-dot chain line in FIG. 2, and shows a locked state by the lock mechanism 90. FIG. FIG. 3B is an enlarged view of a region B surrounded by a two-dot chain line in FIG. 2 and shows a state where the lock by the lock mechanism 90 is released. 3C is a cross-sectional view taken along the line CC in FIG. 3B.

  In the locked state shown in FIG. 3A, the first engaging portion 94 of the moving member 84 (seal ring moving mechanism) engages with the second engaging portion 95 of the valve body 40. The first engaging portion 94 of the moving member 84 is, for example, a protruding portion of the moving member 84 (a portion protruding in the positive direction of the X axis). On the other hand, the 2nd engaging part 95 of the valve body 40 is a recessed part provided in the surface of the valve body 40, for example. In the example shown in FIG. 3A, the first engagement portion 94 and the second engagement portion 95 are engaged, whereby the valve body 40 rotates in the + R direction around the rotation axis A1 (Z axis). Is blocked. In addition, by devising the shape of the first engaging portion 94 and the second engaging portion 95, when the first engaging portion 94 and the second engaging portion 95 are engaged with each other, the valve body 40 is used. Is prevented from rotating in the + R direction around the rotation axis A1 (Z axis), and is prevented from rotating in the −R direction around the rotation axis A1 (Z axis). It is also possible to do.

  In the example illustrated in FIG. 3A, the flow path opening / closing valve 10 includes a lock mechanism 90. For this reason, when the power supply for operating the flow path opening / closing valve 10 is OFF, the movement of the valve body 4 is effectively prevented. When the flow path opening / closing valve 10 is disposed in the flow path of the propellant (for example, liquid hydrogen) of the rocket, the flow path of the propellant is turned off when the power source for operating the flow path opening / closing valve 10 is OFF. Leakage to the downstream side of the on-off valve 10 is effectively suppressed.

  As shown in FIG. 3B, when releasing the lock by the lock mechanism 90, the moving member 84 is moved in the negative X-axis direction against the urging force of the elastic member 86. As the moving member 84 moves, the seal ring 70 held by the moving member 84 moves to the second position P <b> 2 that is separated from the valve body 40. Further, as the moving member 84 moves, the engagement between the first engaging portion 94 of the moving member 84 and the second engaging portion 95 of the valve body 40 is released. As a result, the valve body 40 can rotate around the rotation axis A1 (Z axis).

  In the state shown in FIG. 3B, the seal ring 70 is located at the second position P <b> 2 that is separated from the valve body 40. For this reason, the rotational load torque of the valve body 40 during the opening / closing operation of the flow path opening / closing valve is effectively reduced.

  3C is a CC arrow view of the valve body 40 shown in FIG. 3B. In the example described in FIGS. 3B and 3C, the first engaging portion 94 includes an upper first engaging portion 94 a and a lower first engaging portion 94 b that are spaced apart from each other in the direction along the rotation axis A <b> 1 of the shaft 50. Is provided. 3B and 3C, the second engagement portion 95 is an upper second engagement portion that is spaced apart from each other in the direction along the rotation axis A1 of the shaft 50 (a direction parallel to the Z axis). 95a and a lower second engaging portion 95b. For this reason, in the example described in FIGS. 3B and 3C, the engagement between the first engagement portion 94 and the second engagement portion 95 can be further strengthened.

  As shown in FIG. 3C, the upper second engagement portion 95a and the lower second engagement portion 95b are end surfaces of a recess 96 (for example, a semi-ring recess) provided on the surface of the valve body 40. May be.

FIG. 3D shows a modification of the upper second engaging portion 95a and the lower second engaging portion 95b. 3D is a CC arrow view of the valve body 40 (modification) shown in FIG. 3B. 3E is a cross-sectional view taken along the line GG in FIG. 3D. 3B, FIG. 3D, and FIG. 3E, the 2nd engaging part 95 is spaced apart from each other in the direction along the rotation axis A1 of the shaft 50 (direction parallel to the Z axis). A portion 95a and a lower second engagement portion 95b are provided. For this reason, in the example described in FIGS. 3B, 3D, and 3E, the engagement between the first engagement portion 94 and the second engagement portion 95 can be further strengthened. The upper second engaging portion 95a and the lower second engaging portion 95b may be end surfaces of the recess 96 provided on the surface of the valve body 40.

  In the example illustrated in FIGS. 3C to 3E, the valve body 40 has a smooth contact surface 97 on the upper surface connected to the second engagement portion 95. More specifically, the valve body 40 has a smooth upper contact surface 97a on the upper stage surface connected to the upper second engagement portion 95a, and the valve body 40 is connected to the lower second engagement portion 95b. A smooth lower contact surface 97b is provided on the upper stage surface that is continuously provided. For this reason, even if it is a case where the 1st engaging part 94 contacts the contact surface (97a, 97b) of the valve body 40 at the time of rotation of the valve body 40 due to vibration etc., contact surface (97a, 97b). ) Is smooth, the rotation of the valve body 40 is not hindered.

  In the example described in FIGS. 2 to 3E, the seal ring moving mechanism 80 is provided with the first engaging portion 94 of the lock mechanism 90. For this reason, it is not necessary to provide a new drive mechanism or the like in order to operate the lock mechanism 90. As a result, complication of the flow path opening / closing valve 10 is suppressed.

(Modification of lock mechanism)
FIG. 4 is a schematic cross-sectional view showing a modification of the lock mechanism. The example shown in FIG. 4 is different from the examples shown in FIGS. 2 to 3C in that the first engagement portion 94 is provided on the seal ring 70. The example described in FIG. 4 is otherwise the same as the example described in FIGS. 2 to 3C.

  The first engagement portion 94 of the seal ring 70 is, for example, a tip portion of the seal ring 70. On the other hand, the 2nd engaging part 95 of the valve body 40 is a recessed part provided in the surface of the valve body 40, for example. In the example illustrated in FIG. 4, the first engagement portion 94 and the second engagement portion 95 are engaged, whereby the valve body 40 rotates in the + R direction around the rotation axis A1 (Z axis). Is blocked.

  In the example illustrated in FIG. 4, the first engagement portion 94 of the lock mechanism 90 is provided on the seal ring 70. For this reason, it is not necessary to provide a new drive mechanism or the like in order to operate the lock mechanism 90. As a result, complication of the flow path opening / closing valve 10 is suppressed.

(Detailed explanation of flow path opening and closing valve)
The flow path opening / closing valve 10 will be described in more detail with reference to FIGS. 5 to 7C. 5 to 7C, members having the same functions as those described in FIGS. 2 to 4 are given the same reference numerals. The repeated description of the members with the same drawing number will be omitted.

  FIG. 5 is a schematic cross-sectional view schematically showing the flow path opening / closing valve 10. As shown in FIG. 5, the flow path opening / closing valve 10 includes a valve housing 30, a valve body 40 (ball valve body), a shaft 50, a first drive mechanism 60 that rotates the shaft, a seal ring 70, A seal ring moving mechanism 80 and a lock mechanism 90 are provided. The bearing 52 is a bearing that rotatably supports the shaft 50.

(Valve 40)
The valve body 40 is disposed in the flow path 20 and can rotate around the rotation axis A <b> 1 together with the shaft 50. The valve body 40 may be provided with a valve body flow path 42. When the valve body 40 is in the closed position, the valve body flow path 42 is inconsistent with the flow path 20. When the valve body 40 is in the open position, the valve body flow path 42 is aligned with the flow path 20.

  The valve body 40 illustrated in FIG. 5 includes a spherically shaped portion 40 a that is seated on the seal ring 70 when the flow path opening / closing valve 10 is closed. The center of curvature A2 of the spherical shape portion 40a is not on the rotation axis A1 of the shaft (in the example shown in FIG. 2, the curvature center A2 of the spherical shape portion is in the negative Y-axis direction with respect to the rotation axis A1 of the shaft. Eccentric.

(First drive mechanism)
The first drive mechanism 60 can rotate the shaft 50 using power from a drive source such as a motor. As the shaft 50 rotates, the valve body 40 rotates between the closed position and the open position. FIG. 5 shows a state in which the valve body 40 is in the closed position.

  The first drive mechanism 60 includes, for example, a motor 62, a ball screw 64 connected to the output shaft of the motor 62, a ball nut 65, a link mechanism including a first link member 66 and a second link member 67. Prepare. The bearing 63 is a bearing that rotatably supports the ball screw 64.

  6A and 6B are schematic perspective views schematically showing the flow path opening / closing valve 10. 6A is a schematic perspective view showing a state in which the flow path opening / closing valve 10 is closed, and FIG. 6B is a schematic perspective view showing a state in which the flow path opening / closing valve 10 is opened. Referring to FIG. 6A, the first end of the first link member 66 is pivotally connected to the ball nut 65, and the second end 66 a of the first link member 66 is connected to the first end of the second link member 67. Pivot connected. The second end of the second link member 67 is connected to the shaft 50 so as not to rotate.

  The operation when the flow path opening / closing valve 10 changes from the closed state shown in FIG. 6A to the open state shown in FIG. 6B will be described. In the state shown in FIG. 6A, the ball nut 65 is located at a position farthest from the motor 62. In the state shown in FIG. 6A, the motor 62 is driven. By driving the motor 62, the output shaft of the motor rotates. The ball screw 64 is rotated by the rotation of the output shaft of the motor. As the ball screw 64 rotates, the ball nut 65 moves in a direction approaching the motor 62. As the ball nut 65 moves in the direction approaching the motor 62, the second end portion 66a of the first link member 66 (and the first end portion of the second link member 67 connected to the second end portion 66a) is moved. Rotate around the rotation axis of the shaft 50 in the + R direction (counterclockwise). The first end portion of the second link member 67 rotates in the + R direction around the rotation axis of the shaft 50, whereby the shaft 50 rotates in the + R direction around the rotation axis of the shaft.

  The operation when the flow path opening / closing valve 10 changes from the open state shown in FIG. 6B to the closed state shown in FIG. 6A changes from the closed state shown in FIG. 6A to the open state shown in FIG. 6B. It is the reverse of the operation when doing.

  5 to 6B, the output shaft of the motor and the rotation axis A1 of the shaft 50 are not coaxial. For this reason, even if the fluid is a cryogenic fluid such as liquid hydrogen, liquid oxygen, or liquid nitrogen, it is possible to reduce the amount of heat transfer between the cryogenic fluid and the motor. In the example shown in FIGS. 6A and 6B, the motor 62 and the shaft 50 can transmit power via a link mechanism. By interposing the link mechanism, it is possible to reduce the amount of heat transfer between the cryogenic fluid and the motor.

(Seal ring moving mechanism 80 and lock mechanism 90)
The seal ring moving mechanism 80 and the lock mechanism 90 will be described with reference to FIGS. 7A to 7C. 7A is an enlarged view of a region D surrounded by a two-dot chain line in FIG. 5, and shows a state in which the seal ring 70 is in contact with the valve body 40 and the valve body 40 is locked by the lock mechanism 90. It is. FIG. 7B is an enlarged view of a region D surrounded by a two-dot chain line in FIG. 5, and shows a state in which the seal ring 70 contacts the valve body 40 and the lock of the valve body 40 is released. . FIG. 7C is an enlarged view of a region D surrounded by a two-dot chain line in FIG. 5, and shows a state where the seal ring 70 is separated from the valve body 40 and the lock of the valve body 40 is released. .

(Seal ring moving mechanism 80)
The seal ring moving mechanism 80 moves the seal ring 70. The seal ring moving mechanism 80 moves the seal ring 70 along the X-axis direction. The seal ring moving mechanism 80 moves the seal ring 70 between a first position P1 that can contact the valve body 40 and a second position P2 that is separated from the valve body 40. 7A and 7B show a state where the seal ring 70 is in the first position P1.

  The seal ring moving mechanism 80 may be any mechanism as long as it moves the seal ring 70. In the example described in FIG. 7A, the seal ring moving mechanism 80 includes a moving member 84 and a second drive mechanism that moves the moving member 84. In the example described in FIG. 7A, the second drive mechanism is a solenoid 82. Alternatively, the second drive mechanism may be a fluid operated actuator.

  The moving member 84 includes a moving member main body 84A. The moving member main body 84A moves in the X axis positive direction or the X axis negative direction by the action of the second drive mechanism. More specifically, the moving member main body 84 </ b> A moves in the positive X-axis direction or the negative X-axis direction in response to the current flowing through the solenoid 82.

  In the example described in FIG. 7A, the moving member main body 84A includes an armature 84A1 and a protruding member 84A2 fixed so as not to move with respect to the armature 84A1. The protruding member 84A2 is, for example, an annular member.

  The moving member main body 84 </ b> A (the distal end portion of the moving member main body) includes a seal ring engaging portion 84 a that can engage with the seal ring 70. The seal ring engaging portion 84a engages with the seal ring 70 when the moving member main body 84A moves in the negative direction of the X axis (in other words, in the direction away from the valve body 40). After the seal ring 70 is engaged with the seal ring engagement portion 84a, the seal ring 70 can move together with the moving member main body 84A in the negative X-axis direction (in other words, the direction away from the valve body 40) ( If necessary, see FIG. 7C).

  The moving member 84 includes a slider 84B that can move relative to the moving member main body 84A, a first elastic member 84C (for example, a coil spring) disposed between the moving member main body 84A and the slider 84B, and the valve housing 30. And a second elastic member 84D (for example, a disc spring) disposed between the slider 84B and the slider 84B.

  When the current does not flow through the solenoid 82 (in other words, when the second drive mechanism is in an inoperative state), the moving member main body 84A is moved in the positive X-axis direction by the first elastic member 84C and the second elastic member 84D ( That is, it is urged | biased toward the valve body 40.

  The slider 84B is urged toward the positive direction of the X axis (that is, the direction toward the valve body 40) by the second elastic member 84D. The slider 84 </ b> B (the end portion of the slider) includes a seal ring engaging portion 84 b that can engage with the seal ring 70. The slider 84B biased by the second elastic member 84D presses the seal ring 70 against the valve body 40 via the seal ring engaging portion 84b. In other words, the seal ring 70 is effectively pressed against the spherical shape portion 40a of the valve body 40 by the urging force of the second elastic member 84D acting on the slider 84B. When the seal ring 70 is effectively pressed against the spherical surface portion 40 a of the valve body 40, the valve body 40 is reliably sealed by the seal ring 70.

  The first elastic member 84C is disposed between the moving member main body 84A and the slider 84B. More specifically, the first elastic member 84C is disposed between the elastic member receiving member 84a1 provided in the moving member main body 84A and the side protrusion 84b1 of the slider 84B.

  The second elastic member 84D is disposed between the valve housing 30 and the slider 84B. More specifically, the second elastic member 84D is disposed between the elastic member receiving member 31 provided in the valve housing 30 and the side protrusion 84b1 of the slider 84B. The second elastic member 84D may be an elastic member configured by stacking a plurality of disc springs.

  In the example shown in FIG. 7A, the side protrusion 84b1 of the slider 84B is sandwiched between the first elastic member 84C and the second elastic member 84D.

  In the example shown in FIG. 7A, the elastic modulus of the second elastic member 84D is larger than the elastic modulus of the first elastic member 84C. For this reason, when the moving member main body 84A moves toward the negative direction of the X-axis, until the seal ring engaging portion 84a of the moving member main body 84A engages with the seal ring 70, the first is mainly performed. The elastic member 84C contracts. On the other hand, when the moving member main body 84A moves in the negative direction of the X axis, the second elastic member 84D contracts after the seal ring engaging portion 84a of the moving member main body 84A and the seal ring 70 are engaged. Will be.

(Lock mechanism 90)
The lock mechanism 90 is a mechanism that prevents the valve body 40 from rotating. The lock mechanism 90 includes a first engagement portion 94 provided in the seal ring movement mechanism 80 (more specifically, the movement member 84 or the movement member main body 84A), and a second engagement portion 95 provided in the valve body 40. Is provided.

  In the locked state shown in FIG. 7A, the first engaging portion 94 of the moving member 84 (seal ring moving mechanism) is engaged with the second engaging portion 95 of the valve body 40. The first engaging portion 94 of the moving member 84 is, for example, a protruding portion of the moving member 84 (a portion protruding in the positive direction of the X axis). On the other hand, the 2nd engaging part 95 of the valve body 40 is a recessed part provided in the surface of the valve body 40, for example. In the example shown in FIG. 7A, the first engagement portion 94 and the second engagement portion 95 are engaged, whereby the valve body 40 rotates in the + R direction around the rotation axis A1 (Z axis). Is blocked.

  As shown in FIG. 7A, the flow path opening / closing valve 10 includes a lock mechanism 90. For this reason, when the power supply for operating the flow path opening / closing valve 10 is OFF, the valve body 4 is effectively prevented from moving in the opening direction.

(Seal ring moving and unlocking operations)
Next, with reference to FIG. 7A thru | or FIG. 7C, the movement operation | movement of a seal ring and the lock release operation | movement are demonstrated.

  In the state shown in FIG. 7A, no current flows through the solenoid 82 (in other words, in the state shown in FIG. 7A, the second drive mechanism is in an inoperative state). 7A, the slider 84B and the seal ring 70 pressed by the slider 84B are urged toward the valve body 40 by the second elastic member 84D. As a result, the seal ring 70 comes into close contact with the spherical shape portion 40 a of the valve body 40.

  7A, the moving member main body 84A is urged toward the valve body 40 by the first elastic member 84C. And the 1st engaging part 94 provided in the moving member main body 84A and the 2nd engaging part 95 provided in the valve body 40 engage. As a result, rotation of the valve body 40 (rotation around the rotation axis of the shaft 50) is effectively prevented.

  In the state shown in FIG. 7A, it is assumed that a current is passed through solenoid 82 (in other words, in the state shown in FIG. 7A, it is assumed that the second drive mechanism is in an operating state). By the operation of the second drive mechanism, the moving member main body 84A moves in a direction away from the valve body 40 (X-axis negative direction). As the moving member main body 84A moves, the first elastic member 84C contracts. Further, with the movement of the moving member main body 84A, the engagement between the first engaging portion 94 provided on the moving member main body 84A and the second engaging portion 95 provided on the valve body 40 is released. FIG. 7B shows a state after the engagement between the first engagement portion 94 and the second engagement portion 95 is released. Since the elastic modulus of the second elastic member 84D is larger than the elastic modulus of the first elastic member 84C, the contraction amount of the second elastic member 84D is smaller than the contraction amount of the first elastic member 84C. As a result, in the state illustrated in FIG. 7B, the state in which the seal ring 70 is in close contact with the spherical shape portion 40a of the valve body 40 is maintained.

  In the state illustrated in FIG. 7B, it is assumed that the moving member main body 84 </ b> A is further moved in the direction away from the valve body 40 (X-axis negative direction) by passing a current through the solenoid 82. 7B, the seal ring engaging portion 84a of the moving member main body 84A is engaged with the seal ring 70. For this reason, when the moving member main body 84A is further moved in the direction away from the valve body 40 (X-axis negative direction), the moving member main body 84A presses the slider 84B via the seal ring 70. . As a result, the slider 84B and the seal ring 70 move in the direction away from the valve body 40 (X-axis negative direction). As the seal ring 70 moves, the seal ring 70 moves away from the valve body 40. Further, the second elastic member 84D contracts with the movement of the slider 84B. FIG. 7C shows a state after the seal ring 70 is separated from the valve body 40.

  In the state shown in FIG. 7C, the seal ring 70 is separated from the valve body 40. In the state shown in FIG. 7C, if the valve body 40 is rotated (in other words, if the shaft 50 is rotated). ), The flow path opening / closing valve 10 can be opened. Further, in the state illustrated in FIG. 7C, the valve body 40 and the seal ring 70 are not in contact with each other, and therefore it is possible to suppress the rotational load torque that rotates the valve body 40.

  In the example illustrated in FIGS. 6 to 7C, the seal ring moving mechanism 80 is provided with the first engagement portion 94 of the lock mechanism 90. For this reason, it is not necessary to provide a new drive mechanism or the like in order to operate the lock mechanism 90. As a result, complication of the flow path opening / closing valve 10 is suppressed.

  In order to return from the state illustrated in FIG. 7C to the state illustrated in FIG. 7A (the state in which the seal ring 70 is in contact with the valve body 40 and the valve body 40 is locked by the lock mechanism 90), for example, After the valve body 40 is moved to the closed position, the current supplied to the solenoid 82 may be interrupted (in other words, the second drive mechanism may be deactivated).

  In FIG. 7A, the seal member 100 is a member that seals between the slider 84 </ b> B and the valve housing 30.

(Shim member)
FIG. 7D shows a modification of the seal ring moving mechanism and the lock mechanism described in FIG. 7A. FIG. 7D is an enlarged view of a region D surrounded by a two-dot chain line in FIG. 5, and shows a state in which the seal ring 70 is in contact with the valve body 40 and the valve body 40 is locked by the locking mechanism 90. It is. The example shown in FIG. 7D is different from the example shown in FIG. 7A in that the shim member 200 is disposed between the moving member 84 (more specifically, the moving member main body 84A) and the valve housing 30. Different. The example described in FIG. 7D is otherwise the same as the example described in FIG. 7A.

  In the example illustrated in FIG. 7D, the engagement area between the first engagement portion 94 and the second engagement portion 95 can be adjusted by arranging the shim member 200. Therefore, according to the magnitude of the torque generated by the fluid pressure acting on the valve body 40 when locked by the lock mechanism 90 (when the first engagement portion 94 and the second engagement portion 95 are engaged). Thus, an appropriate engagement area can be ensured. That is, by adjusting the thickness of the shim member 200 or the number of the shim members 200, an appropriate engagement area can be secured.

(Example of first engaging portion and second engaging portion)
8A and 8B show an example of the first engaging portion 94 and the second engaging portion 95. FIG. FIG. 8A is a schematic plan view of the protruding member 84A2 that is the moving member main body 84A and the valve body 40 as viewed from the positive Z-axis direction to the negative Z-axis direction. FIG. 8B is a schematic side view of the protruding member 84A2 that is the moving member main body 84A as viewed from the X-axis negative direction toward the X-axis positive direction. 8A and 8B, members having the same functions as those described in FIGS. 2 to 7D are given the same reference numerals. The repeated description of the members with the same drawing number will be omitted.

  In the example described in FIGS. 8A and 8B, two projecting portions 98 projecting toward the valve body 40 are provided at the tip of the projecting member 84A2 (moving member main body 84A). And the upper protrusion part 98-1 (protrusion part on the Z-axis positive direction side) of the two protrusion parts 98 includes the upper first engagement part 94a. Further, the lower protrusion 98-2 (the protrusion on the Z-axis negative direction side) of the two protrusions 98 includes the lower first engagement portion 94b. Protruding member 84A2 (moving member main body 84A) includes two first engaging portions (a plurality of first engaging portions 94) that are spaced apart along a direction parallel to the longitudinal direction of shaft 50. When the valve body 40 is locked, the rotation of the valve body 40 is reliably prevented.

  8B, the imaginary straight line L connecting the upper first engaging portion 94a and the lower engaging portion 94b is the central portion of the flow path 20 in the cross section perpendicular to the longitudinal direction of the flow path 20. The upper first engaging portion 94a and the lower engaging portion 94b are arranged so as to pass through the center (including the center and the vicinity thereof). By adopting this arrangement, it is possible to reduce the protruding amount of the protruding portion 98 protruding toward the valve element 40 arranged eccentrically (the valve element 40 arranged so that A1 ≠ A2). . In other words, when the upper first engaging portion 94a and the lower engaging portion 94b are arranged differently from the example shown in FIG. 8B, the second engaging portion 95 provided on the valve body 40 and In order to realize this engagement, it is necessary to relatively increase the protruding amount of the protruding portion 98.

  In the example described in FIGS. 8A and 8B, the surface facing the valve body 40 among the surfaces of the projecting portions 98 is a smooth surface 98a having a constant inclination angle or a continuously changing inclination angle. It is possible to make the rotation of the valve body 40 smooth by making the surface facing the valve body 40 of the surface of each projecting portion a surface 98a having a constant inclination angle or a continuously changing inclination angle. . That is, the rotation of the valve body 40 is not hindered even when the second engagement portion 95 temporarily contacts the surface 98a due to vibration or the like.

  In the example shown in FIG. 8A, the center of curvature A2 of the spherical shape portion of the valve body 40 is decentered in the negative Y-axis direction with respect to the rotation axis A1 of the shaft 50.

  8A and 8B are diagrams corresponding to the case where the protruding member 84A2 is located in the state shown in FIG. 7A. After the protruding member 84A2 moves to the position shown in FIG. 7B (when the lock is released), the valve body 40 can be rotated around the rotation axis A1. FIG. 8C shows a state after the valve body 40 is rotated by 10 ° around the rotation axis A1. In the state shown in FIG. 8C, the flow path opening / closing valve is in a closed state. Thereafter, it is assumed that the protruding member 84A2 moves to the position shown in FIG. 7C and the valve body further rotates around the rotation axis A1. FIG. 7D shows a state after the valve body 40 has rotated 90 ° around the rotation axis A1 from the position shown in FIG. 8A. In the state illustrated in FIG. 8D, the protruding member 84A2 is not in contact with the valve body 40. For this reason, it is possible to reduce the torque required for rotation of the valve body 40.

  The present invention is not limited to the embodiments described above, and it is obvious that the embodiments can be appropriately modified or changed within the scope of the technical idea of the present invention. Various techniques used in each embodiment or modification can be applied to other embodiments or modifications as long as no technical contradiction arises.

1: Channel opening / closing valve 2: Channel 3: Valve housing 4: Valve body 4a: Spherical shape portion 7: Seal ring 10: Channel opening / closing valve 20: Channel 20A: Upstream channel 20B: Downstream channel 30 : Valve housing 31: Elastic member receiving member 40: Valve body 40a: Spherical surface portion 42: Valve body flow path 50: Shaft 52: Bearing 60: First drive mechanism 62: Motor 63: Bearing 64: Ball screw 65: Ball nut 66: first link member 66a: second end 67: second link member 70: seal ring 80: seal ring moving mechanism 82: solenoid 84: moving member 84A: moving member main body 84A1: armature 84A2: projecting member 84B: slider 84C: first elastic member 84D: second elastic member 84a: seal ring engaging portion 84a1: elastic member receiving member 84b: seal ring engagement Portion 84b1: Side protrusion 86: Elastic member 90: Lock mechanism 94: First engagement portion 94a: Upper first engagement portion 94b: Lower first engagement portion 95: Second engagement portion 95a: Upper first 2 engaging portion 95b: lower second engaging portion 96: recessed portion 97: contact surface 97a: upper contact surface 97b: lower contact surface 98: projecting portion 98-1: upper projecting portion 98-2: lower side Projection 98a: surface 100: seal member 200: shim member A1: rotation axis A2: center of curvature P1: first position P2: second position L: virtual straight line

Claims (11)

A valve housing having a flow path;
A valve element disposed in the flow path and rotatable with the shaft;
A first drive mechanism for rotating the shaft;
A seal ring that is disposed in the flow path and on which the valve body sits;
A seal ring moving mechanism that moves the seal ring between a first position that can contact the valve body and a second position that is separated from the valve body;
A locking mechanism for preventing rotation of the valve body,
The locking mechanism is
A first engagement portion provided in the seal ring or the seal ring moving mechanism;
A second engagement portion provided on the valve body;
A flow path opening / closing valve. The flow path on-off valve according to claim 1, wherein the valve body includes a spherical shape portion that is seated on the seal ring. The said 1st engaging part is provided with the upper side 1st engaging part and lower side 1st engaging part which were mutually spaced apart along the direction parallel to the longitudinal direction of the said shaft. Channel open / close valve. The flow path opening / closing valve according to claim 3, wherein an imaginary straight line connecting the upper first engagement portion and the lower engagement portion passes through a central portion of the flow path in a cross section perpendicular to the longitudinal direction of the flow path. . The flow path opening / closing valve according to any one of claims 2 to 4, wherein a center of curvature of the spherical shape portion is not on a rotation axis of the shaft. The seal ring moving mechanism is
A movable member movable relative to the valve housing and engageable with the seal ring;
A flow path opening / closing valve according to any one of claims 1 to 5, further comprising: a second drive mechanism that moves the moving member. The flow path on-off valve according to claim 6, wherein the first engagement portion is provided on the moving member. The moving member includes a moving member main body moved by the second drive mechanism;
A slider movable relative to the moving member body;
The flow path on-off valve according to claim 6 or 7, comprising a first elastic member disposed between the moving member main body and the slider. The seal ring moving mechanism includes a second elastic member disposed between the valve housing and the slider,
The flow path on-off valve according to claim 8, wherein an elastic modulus of the second elastic member is larger than an elastic modulus of the first elastic member. The flow path opening / closing valve according to any one of claims 6 to 9, further comprising a shim member disposed between the moving member and the valve housing. The surface which faces the said valve body among the surfaces of the protrusion part provided with a said 1st engaging part is a surface where an inclination angle is constant, or an inclination angle changes continuously. The flow-path on-off valve of description.

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