JP2012067882A - Passage switching valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve that allows fluid to be quickly circulated when switching a ball valve from a valve-closing state and can be controlled by a flow rate according to an operation amount of the ball valve.SOLUTION: A ball valve 14 is rotatably provided inside a body 12 constituting the passage switching valve 10. First/second notches 52a, 52b notched almost in parallel with a thorough-hole 42 are formed on the outer peripheral surface of the ball valve 14. The first/second notches 52a, 52b are arranged so as to respectively face first/second valve seats 16, 18 in a valve closing state where the ball valve 14 is rotated. Almost simultaneously with the start of the rotation of the ball valve 14, gaps 62a, 62b are generated between the first/second notches 52a, 52b and the first/second valve seats 16, 18, thereby allowing circulation of exhaust gas to the downstream side via the gaps 62a, 62b.

Description

  The present invention relates to a flow path opening / closing valve that switches a flow state of a fluid by opening and closing a flow path through which the fluid flows.

  2. Description of the Related Art Conventionally, for example, a channel opening / closing valve that is connected to a fluid flow channel and controls the fluid flow state by switching the communication state of the flow channel is known.

  In such a flow path opening / closing valve, a ball valve is provided inside the valve body, and a through-hole penetrating in a straight line is formed inside the ball valve. The through hole of the ball valve is orthogonal to a pair of passages formed in the valve body, and the outer peripheral surface of the ball valve abuts on a valve seat member provided at each end of the passage, thereby allowing fluid to flow. On the other hand, the ball valve is rotationally driven and the through-hole is in a straight line with the passage so that the passage communicates with each other (for example, Patent Document 1). reference).

Japanese Patent Laid-Open No. 2005-9512

  However, in the flow path opening / closing valve as described above, when the ball valve is rotated in order to change from the valve closed state in which one passage and the other passage are closed by the ball valve to the valve open state, the ball valve is Since there is a time difference between the start of rotation and the through hole communicating with the passage, a predetermined time is required until the fluid starts to flow through the passage through the through hole, and the fluid has a desired flow rate. There is a problem that it takes time to reach.

  The present invention has been made in consideration of the above-mentioned problems, and when switching the ball valve from the valve closed state, the fluid can be started to flow quickly, and the fluid according to the operation amount of the ball valve It is an object of the present invention to provide a flow path opening / closing valve capable of obtaining a flow rate of 2.

In order to achieve the above object, the present invention provides a body having a pair of ports through which fluid is supplied and discharged, a ball valve provided rotatably in a chamber of the body, and the body provided in the body. A flow path opening / closing valve that switches a communication state between one port and the other port by rotating the ball valve.
The ball valve includes a flow path that passes through the center of the ball valve;
A first notch portion that is formed to be recessed with respect to the outer peripheral surface and faces the one port on the upstream side when the fluid is supplied in a closed state in which communication between the one port and the other port is blocked;
A second notch facing the other port on the downstream side from which the fluid is discharged;
It is characterized by providing.

  According to the present invention, a valve in which the first and second notches recessed with respect to the outer peripheral surface are provided on the outer peripheral surface of the ball valve, and communication between one port and the other port is blocked by the ball valve. In the closed state, the outer peripheral surface of the ball valve faces the seat member that comes into contact, and the fluid is supplied to the first port on the upstream side and the second notch on the other port on the downstream side. It is arranged so that the notch faces. When the ball valve is rotated from the valve closed state, the first and second notches are formed before the through hole of the ball valve communicates with the port or simultaneously with the communication of the through hole and the port. The fluid can be circulated from one port to the other through a gap formed between the portion and the seal member.

  Accordingly, the ball valve is started to rotate from the closed state, and the fluid is allowed to flow downstream through the gap formed by the first and second cutouts before or at the same time as the through hole communicates. The flow rate of the fluid can be gradually increased according to the operation amount of the ball valve. As a result, when the ball valve is rotated, the fluid can be started to flow rapidly downstream, and the fluid can be circulated with high accuracy at a flow rate corresponding to the operation amount of the ball valve. .

  Further, the first cutout portion and the second cutout portion may be formed in a shape that is symmetric with respect to the center of the ball valve.

  Further, the first and second cutouts may be formed by cutting out the outer peripheral surface of the ball valve into a flat shape.

  According to the present invention, the following effects can be obtained.

  That is, the first and second cutout portions that are recessed with respect to the outer peripheral surface are provided on the outer peripheral surface of the ball valve, and the first and second cutout portions are connected to one port and the other port by the ball valve. When the valve is closed, the outer peripheral surface of the ball valve faces the seat member that comes into contact with, and faces the one port on the upstream side and the other port on the downstream side to which the fluid is supplied. By arranging in this way, when the ball valve is rotated, the first and second notches are formed before the through hole communicates with the port or at the same time as the through hole communicates with the port. The fluid can be circulated from one port to the other through a gap formed with the seal member. As a result, when the ball valve is turned from the valve closed state, the fluid can be quickly started to flow downstream, and the fluid can be circulated with high accuracy at a flow rate corresponding to the operation amount of the ball valve. It becomes possible to make it.

It is a whole longitudinal cross-sectional view of the flow-path on-off valve which concerns on embodiment of this invention. 2A is a cross-sectional view taken along line IIA-IIA in FIG. 1, and FIG. 2B is an enlarged cross-sectional view showing a state in which the ball valve in FIG. 2A is rotated by a predetermined angle. 3A is an enlarged cross-sectional view showing a state where the ball valve of FIG. 2B is further rotated by a predetermined angle, and FIG. 3B is an enlarged cross-sectional view showing a fully opened state where the ball valve of FIG. 3A is further rotated. It is.

  A preferred embodiment of a flow path opening / closing valve according to the present invention will be described below and described in detail with reference to the accompanying drawings.

  In FIG. 1, reference numeral 10 indicates a flow path opening / closing valve according to an embodiment of the present invention. Here, a case will be described in which the flow path opening / closing valve 10 is used as an EGR switching valve for recirculating exhaust gas discharged from an internal combustion engine such as an automobile to the internal combustion engine.

  As shown in FIGS. 1 to 3, the flow path opening / closing valve 10 includes a body main body 12, a ball valve 14 rotatably provided inside the body main body 12, and an outer peripheral surface of the ball valve 14. The first and second valve seats 16 and 18 are in contact with each other, and a driving force transmission mechanism 20 is provided on the body main body 12 and applies a rotational driving force to the ball valve 14.

  Under the body main body 12, for example, a gas inlet (port) 22 to which exhaust gas (fluid) E is supplied and the opposite side are provided, and the exhaust gas E is led out to generate an internal combustion engine (see FIG. A gas outlet (port) 24 is provided for circulation to a not shown). In the body main body 12, the gas inlet 22 and the gas outlet 24 are provided on a substantially straight line. Further, a communication chamber 26 is formed in the body main body 12 between the gas inlet 22 and the gas outlet 24, and a substantially spherical ball valve 14 is rotatably disposed inside the communication chamber 26. .

  A first valve seat (seat member) 16 is provided between the communication chamber 26 and the gas inlet 22, and the first valve seat 16 is integrated with the small diameter portion 28 and the small diameter portion 28. And a large-diameter portion 30. The small-diameter portion 28 is disposed in the body main body 12 so as to face the gas inlet 22 and the large-diameter portion 30 faces the ball valve 14. The large-diameter portion 30 is provided with a wave washer 32 between itself and the body main body 12, and the first valve seat 16 always moves toward the ball valve 14 (in the direction of arrow A) by the elastic force of the wave washer 32. The ball valve 14 is seated by the large-diameter portion 30 that is energized.

  A first communication hole 34 communicating with the gas inlet 22 is formed at the center of the first valve seat 16 and penetrates along the axial direction (arrows A and B directions). A first seat surface 36 with which the ball valve 14 abuts is formed on the end surface.

  On the other hand, a ring-shaped second valve seat (seat member) 18 is provided between the communication chamber 26 and the gas outlet 24, and the second valve seat 18 is connected to the gas outlet 24 and the communication chamber 26. It is mounted in an annular mounting groove formed therebetween.

  The second valve seat 18 is disposed such that one end surface thereof faces the communication chamber 26 and contacts the outer peripheral surface of the ball valve 14, and the other side surface thereof faces the gas outlet 24. The second valve seat 18 is provided coaxially with the first valve seat 16 with the communication chamber 26 as the center.

  A second communication hole 38 communicating with the gas outlet 24 is formed at the center of the second valve seat 18 and penetrates along the axial direction (the directions of arrows A and B). A second seat surface 40 with which the ball valve 14 abuts is formed on one end surface of the second valve seat 18. The first and second seat surfaces 36 and 40 are formed in a circular arc shape that is recessed in the radially outward direction corresponding to the outer peripheral surface of the ball valve 14.

  In the ball valve 14, one curved surface and the other curved surface are removed so as to be orthogonal to the central axis, and a through hole (flow path) 42 penetrating from one surface to the other surface along the central axis is formed. Sphere. A flat rectangular recess 44 is formed at the top perpendicular to the through hole 42, and an end 46a of a shaft shaft 46 to be described later is inserted.

  The through hole 42 has a first opening 48 facing the gas inlet 22 and a second opening 50 facing the gas outlet 24 in the valve open state of the ball valve 14, and the first opening A straight line is formed from 48 to the second opening 50.

  On the other hand, on the outer peripheral surface of the ball valve 14, first and second cutout portions 52 a and 52 b cut out substantially parallel to the through hole 42 are formed. The first and second cutout portions 52a and 52b are respectively formed in portions that are lateral to the top portion where the recess 44 is provided in the ball valve 14, and are centered with respect to the outer peripheral surface (on the through hole 42 side). Are formed in a plane shape that is cut out at a predetermined depth toward and parallel to each other. In other words, the first and second cutout portions 52a and 52b are formed at positions and shapes that are symmetric about the center of the ball valve 14 or the through hole 42.

  When the ball valve 14 closes the communication between the gas inlet 22 and the gas outlet 24, the first notch 52a faces the first valve seat 16, and the second notch 52b is the second valve seat. 18 (see FIG. 2A).

  Specifically, as shown in FIGS. 1 and 2A, when the through hole 42 of the ball valve 14 is in a valve-closed state orthogonal to the first and second valve seats 16 and 18, the first valve seat 16 has a first shape. A range (see D1 in FIG. 2A) in which the seal portion 14a is added to a region from the seal portion 14a of the ball valve 14 contacting the one seat surface 36 to the first opening 48 of the through hole 42 is a first non-communication. Let it be region (range) S1. On the other hand, when the through hole 42 of the ball valve 14 is in the valve closed state orthogonal to the first and second valve seats 16, 18, the seal of the ball valve 14 that abuts on the second seat surface 40 of the second valve seat 18. A range (see D2 in FIG. 2A) in which the seal portion 14b is added to the region from the portion 14b to the second opening 50 of the through hole 42 is a second non-communication region (range) S2.

  In the ball valve 14, the first non-communication region S <b> 1 that is the outer peripheral surface between the first notch 52 a and the through hole 42 abuts against the first seat surface 36 of the first valve seat 16, The second non-communication region S2 that is the outer peripheral surface between the two notches 52b and the through hole 42 abuts against the second seat surface 40 of the second valve seat 18.

  In other words, the first and second cutout portions 52a and 52b are formed on the outer peripheral surface of the ball valve 14 with respect to the first and second non-communication regions S1 and S2 and the first and second valve seats 16 and 18. A portion having an arcuate cross section on the side is formed by being cut out.

  The driving force transmission mechanism 20 is connected to a shaft shaft 46 connected to the top of the ball valve 14, a rotary yoke 54 connected to the upper end of the shaft shaft 46, and an upper part of the body main body 12. And a drive source (not shown) for driving the shaft 46 to rotate.

  The shaft 46 is rotatably supported by a pair of bearings 58 a and 58 b provided inside the body body 12, and a lower end portion of the shaft shaft 46 is formed in a rectangular shape in the communication chamber 26. Inserted. Further, the upper end portion of the shaft 46 is inserted through the substantially central portion of the rotary yoke 54 and is fixed by tightening the nut 60. The end 46a of the shaft 46 is formed in a rectangular cross section that is wide in the direction orthogonal to the extending direction of the through hole 42 of the ball valve 14 (see FIG. 2A).

  The drive source is, for example, a stepping motor or a rotary actuator that is rotationally driven under an energization action, and the rotational driving force is transmitted to the shaft shaft 46 via the rotary yoke 54, thereby being coupled to the shaft shaft 46. The ball valve 14 rotates in a predetermined direction.

  The flow path opening / closing valve 10 according to the embodiment of the present invention is basically configured as described above. Next, the operation and effects thereof will be described. Here, as shown in FIGS. 1 and 2A, the through hole 42 of the ball valve 14 is at a position perpendicular to the gas inlet 22 and the gas outlet 24, and the first and second valve seats 16, The valve closed state in which all of the 18 first and second communication holes 34 and 38 are closed by the ball valve 14 will be described as an initial position.

  In this case, as shown in FIG. 2A, the end 46 a of the shaft 46 is aligned with the center line L connecting the gas inlet 22 and the gas outlet 24 in the body main body 12.

  In the initial position described above, the exhaust gas E is supplied to the gas inlet 22, but the first notch 52 a faces the first valve seat 16 and the second notch 52 b faces the second valve seat 18. In addition, since the ball valve 14 is in contact with the first and second seat surfaces 36 and 40 of the first and second valve seats 16 and 18, the first and second valve seats 16 and 18 pass through the first and second valve seats 16 and 18. The flow of the exhaust gas E into the communication chamber 26 is blocked.

  More specifically, a part of the first and second non-communication areas S1 and S2 of the ball valve 14 is in contact with the first and second seat surfaces 36 and 40 of the first and second valve seats 16 and 18, respectively. They are in contact (see FIG. 2A).

  First, when the driving source is energized, a rotational driving force is transmitted to the shaft 46 via the rotating yoke 54, and the first and second openings 48 and 50 of the through hole 42 are respectively connected to the gas inlet 22 and the gas. The ball valve 14 is rotated so as to approach the outlet 24.

  At this time, as shown in FIG. 2B, for example, when the ball valve 14 is rotated clockwise (arrow C direction) by a predetermined angle θ1 when viewed from the shaft shaft 46 side, the first notch 52a is connected to the first communication portion. While gradually moving away from the hole 34, the second notch 52b gradually moves away from the second communication hole 38. The first non-communication region S1 on the first opening 48 side with the first notch 52a interposed therebetween and the second non-communication region S2 on the second opening 50 side with the second notch 52b interposed therebetween are respectively first The second valve seats 16 and 18 are moved closer to each other, while the first non-communication region S1 and the second notch 52b on the second opening 50 side are sandwiched between the first notch 52a and the second notch 52b. The second non-communication region S2 on the first opening 48 side moves in a direction away from the first and second valve seats 16 and 18, respectively.

  As a result, a part of the first notch 52a faces the first sheet surface 36, and a part of the second notch 52b faces the second sheet surface 40, so that the first notch 52a and the first notch 52a The gaps 62a and 62b are formed between the first sheet surface 36 and the second notch 52b and the second sheet surface 40, respectively, and the exhaust gas E supplied to the gas inlet 22 is transferred to the gap 62a, It is introduced into the communication chamber 26 through 62b.

  At this time, the first and second cutout portions 52a and 52b are formed at positions and shapes that are symmetrical with respect to the center of the ball valve 14 or the through hole 42, and the first and second valve seats 16, Since the first and second sheet surfaces 36 and 40 in FIG. 18 are also formed in a symmetrical shape, the gap 62a formed by the first cutout 52a and the gap 62b formed by the second cutout 52b The cross-sectional area is the same. Therefore, the flow rate of the exhaust gas flowing into the communication chamber 26 from the gap 62a is substantially equal to the flow rate of the exhaust gas flowing out of the communication chamber 26 through the gap 62b.

  At this time, the first non-communication region S1 on the first opening 48 side with the first notch 52a as the center contacts the first valve seat 16, and the second opening is sandwiched by the second notch 52b. Since the second non-communication region S <b> 2 on the 50 side is in contact with the second valve seat 18, the first opening 48 constituting the through hole 42 has not yet communicated with the first communication hole 34. The second opening 50 is not yet in communication with the second communication hole 38. That is, the communication between the first communication hole 34 and the second communication hole 38 through the through hole 42 is blocked, and the exhaust gas E supplied from the gas inlet 22 passes through the gaps 62a and 62b without passing through the through hole 42. Only through the communication chamber 26 circulates to the gas outlet 24.

  As shown in FIG. 3A, when the ball valve 14 further rotates clockwise (in the direction of arrow C) by a predetermined angle θ2, a part of the first non-communication region S1 on the first opening 48 side becomes part. A part of the first non-communication region S2 on the second opening 50 side is separated from the first sheet surface 36 and at the same time a part of the first opening 48 communicates with the first communication hole 34. A part of the second opening 50 communicates with the second communication hole 38. Then, the first and second openings 48 and 50 of the ball valve 14 gradually become substantially parallel to the first and second seat surfaces 36 and 40. As a result, the cross-sectional area of the gap 62a increases, and the flow rate of the exhaust gas E flowing into the communication chamber 26 through the gap 62a gradually increases. At the same time, the cross-sectional area of the gap 62b increases, and the communication chamber passes through the gap 62b. The flow rate of the exhaust gas E flowing out from the valve 26 gradually increases.

  As a result, in the state where the ball valve 14 is rotated by a predetermined angle θ2, the exhaust gas is exhausted through the gaps 62a and 62b as compared with the flow path opening / closing valve according to the prior art in which the fluid is circulated downstream only through the through hole. Since E can be circulated, the exhaust gas E can be circulated downstream through the through hole 42 and the gaps 62a and 62b at a larger flow rate.

  At this time, the exhaust gas E flowing from the gas inlet 22 to the first communication hole 34 passes from the gas inlet 22 through the gaps 62a and 62b formed by the first and second cutout portions 52a and 52b. At the same time, the gas flows into the second communication hole 38 and the gas outlet 24 through the newly connected through hole 42.

  As shown in FIG. 3B, when the ball valve 14 is further rotated clockwise (in the direction of arrow C), the first opening 48 faces the first communication hole 34 of the first valve seat 16, and The second opening 50 faces the second valve seat 18 and the through hole 42 is aligned with the gas inlet 22 and the gas outlet 24. As a result, a valve open state in which the gas inlet 22 and the gas outlet 24 communicate with each other through the through hole 42 is obtained. As a result, the exhaust gas E supplied to the gas inlet 22 flows through the through hole 42 of the ball valve 14 toward the gas outlet 24 and is introduced into an internal combustion engine (not shown).

  At this time, the first and second cutout portions 52a and 52b move to a position between the first valve seat 16 and the second valve seat 18 in the communication chamber 26, and the first and second non-communication regions. Since S1 and S2 are in contact with parts of the first and second valve seats 16 and 18, respectively, the exhaust gas E does not flow through the first and second cutout portions 52a and 52b. That is, the gaps 62a and 62b defined between the first and second notches 52a and 52b and the first and second valve seats 16 and 18 are eliminated, and the exhaust gas E through the gaps 62a and 62b is eliminated. The distribution of is lost.

  On the other hand, when the flow path opening / closing valve 10 is changed from the valve open state to the valve closed state again, the ball valve 14 is counterclockwise via the shaft 46 by urging a drive source (not shown) in the opposite direction. Rotate around. Thereby, the first and second openings 48 and 50 constituting the through hole 42 gradually move so as to face the first and second seat surfaces 36 and 40 of the first and second valve seats 16 and 18. At the same time, the first and second cutout portions 52a and 52b face the first and second sheet surfaces 36 and 40, respectively, and the gaps 62a and 62b are formed again. As a result, the flow rate of the exhaust gas E flowing through the through hole 42 starts to gradually decrease, and the exhaust gas E flows downstream through the gaps 62a and 62b (see FIG. 3A).

  Further, since the ball valve 14 further rotates counterclockwise, a part of the first and second non-communication areas S1, S2 comes into contact with the first and second seat surfaces 36, 40. The communication between the first opening 48 of the gas inlet 42 and the gas inlet 22 is blocked, and the flow of the exhaust gas E through the through hole 42 is stopped. That is, the exhaust gas E circulates downstream only through the gaps 62a and 62b (see FIG. 2B).

  Finally, the ball valve 14 further rotates counterclockwise, the first and second cutout portions 52a and 52b face the first and second communication holes 34, and the first and second non-communication regions S1, When S2 comes into contact with the first and second sheet surfaces 36 and 40, the flow of the exhaust gas E through the gaps 62a and 62b is blocked, and the flow of the exhaust gas E from the gas inlet 22 to the gas outlet 24 is performed. Is closed completely (see FIG. 2A).

  Next, the relationship between the opening degree (rotation amount) of the ball valve 14 and the flow rate of the exhaust gas E will be briefly described.

  Here, as the ball valve 14 rotates from the valve closed state toward the valve open state, the exhaust gas E first circulates downstream through the gaps 62a and 62b. By communicating, in addition to the exhaust gas E flowing through the gaps 62a and 62b, the exhaust gas E flowing through the through hole 42 flows to the downstream side. Therefore, in the flow path opening / closing valve 10 according to the present invention, the flow rate of the exhaust gas E gradually increases in proportion to the opening degree (rotation amount) of the ball valve 14 from the valve closed state to the valve open state. That is understood. On the other hand, when the flow path opening / closing valve 10 is changed from the valve open state to the valve closed state again, when the ball valve 14 is rotated, the flow rate of the exhaust gas E gradually decreases, and the flow is cut off in the valve closed state. It is understood that the flow rate becomes zero.

  On the other hand, in the flow path opening / closing valve according to the prior art, when the ball valve is rotated to switch from the valve closed state to the valve open state, the exhaust gas E is kept for a while even if the ball valve starts to rotate. It can be understood that the flow rate does not increase and the flow rate starts to increase gradually only after it is rotated to an opening degree (rotation amount) intermediate between the valve closed state and the valve open state. Further, when the ball valve is switched from the valve open state to the valve closed state, the flow of the exhaust gas E is interrupted at the opening degree (rotation amount) that is intermediate between the valve closed state and the valve open state, and the flow rate thereof. It can be understood that the distribution is in a suspended state where the value of 0 is zero.

  That is, in the flow path opening / closing valve according to the prior art, there is a range (dead zone) in which the flow rate of the exhaust gas E does not change with the turning operation of the ball valve. Both the time from the start of circulation until the valve is opened and the time from when the valve is opened to when the circulation of the exhaust gas E is interrupted are short, and the flow rate of the exhaust gas E suddenly increases in the flow path opening / closing valve. Will increase or decrease.

  In the flow path opening / closing valve 10 according to the present invention, the exhaust gas E is quickly moved to the downstream side through the gaps 62a and 62b formed by the first and second notches 52a and 52b from the start of the rotation of the ball valve 14. Since the exhaust gas E can be circulated, the timing at which the exhaust gas E starts to circulate can be advanced, and when the exhaust gas E starts to circulate through the through holes 42, the exhaust gas E is simultaneously transmitted through the gaps 62a and 62b. Since E can be circulated, the flow rate of the exhaust gas E can be increased and circulated in proportion to the opening degree (rotation amount) of the ball valve 14.

  In other words, in comparison with the flow path opening / closing valve according to the prior art, in the present invention, the flow of the exhaust gas E from the valve open state is interrupted during the time from when the exhaust gas E starts to flow until the valve opens. Since the time until the valve is closed is long, the flow rate of the exhaust gas E can be gradually increased or decreased in the flow path opening / closing valve 10.

  As described above, in the present embodiment, the first and second cutout portions 52a and 52b parallel to the through hole 42 are provided on the outer peripheral surface of the ball valve 14, and the first and second cutout portions 52a and 52b are In the closed state in which the communication between the gas inlet 22 and the gas outlet 24 is blocked by the ball valve 14, the first valve seat 16 arranged on the gas inlet 22 side and the gas outlet 24 side are arranged. The second valve seats 18 are arranged so as to face each other. When the ball valve 14 is rotated from the closed state, the first and second cutout portions 52a and 52b are formed before the through hole 42 communicates with the first communication hole 34 of the first valve seat 16. The exhaust gas E can be circulated through the gaps 62a and 62b between the first and second valve seats 16 and 18 to the gas outlet 24 side (in the direction of arrow A) on the downstream side.

  Therefore, the exhaust gas E can be gradually circulated to the downstream side through the gap 62a between the ball valve 14 and the first valve seat 16 at substantially the same time as the ball valve 14 starts to rotate from the valve closed state. In addition, the flow rate of the exhaust gas E can be gradually increased in accordance with the opening degree (rotation amount) of the ball valve 14. That is, the linearity between the opening degree (turning amount) of the ball valve 14 and the flow rate of the exhaust gas E is obtained.

  Further, the exhaust gas E can be circulated from the gas inlet 22 to the gas outlet 24 at a flow rate according to the opening degree (rotation amount) of the shaft 46 and the ball valve 14.

  Further, the depth of the first and second cutout portions 52a and 52b with respect to the outer peripheral surface of the ball valve 14 and the inclination angle with respect to the through hole 42 can be freely set so as to circulate through the first and second cutout portions 52a and 52b. It is possible to freely adjust the flow rate of the exhaust gas E and the timing at which it starts to flow. That is, the depths of the first and second cutout portions 52a and 52b may be set so as to be outside the range of the first and second non-communication areas S1 and S2.

  In addition, the flow path on-off valve according to the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Channel on-off valve 12 ... Body main body 14 ... Ball valve 16 ... 1st valve seat 18 ... 2nd valve seat 20 ... Driving force transmission mechanism 22 ... Gas inflow port 24 ... Gas outflow port 26 ... Communication chamber 34 ... 1st Communication hole 36 ... first sheet surface 38 ... second communication hole 40 ... second sheet surface 42 ... through hole 46 ... shaft shaft 48 ... first opening 50 ... second opening 52a ... first notch 52b ... second Notch 62a, 62b ... Gap

Claims (3)

A body having a pair of ports through which fluid is supplied and discharged; a ball valve rotatably provided in the chamber of the body; and a seat member provided in the body and in contact with an outer peripheral surface of the ball valve. In the flow path opening / closing valve that switches the communication state between one port and the other port by rotating the ball valve,
The ball valve includes a flow path that passes through the center of the ball valve;
A first notch portion that is formed to be recessed with respect to the outer peripheral surface and faces the one port on the upstream side when the fluid is supplied in a closed state in which communication between the one port and the other port is blocked;
A second notch facing the other port on the downstream side from which the fluid is discharged;
A flow path opening / closing valve comprising: The flow path opening / closing valve according to claim 1,
The flow path opening / closing valve, wherein the first cutout portion and the second cutout portion are formed in a shape symmetrical with respect to a center of the ball valve. In the flow path on-off valve according to claim 1 or 2,
The flow path on-off valve, wherein the first and second cutout portions are formed by cutting out the outer peripheral surface of the ball valve into a flat shape.

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