JP2012050707A - Stopcock and liquid feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent gas from being mixed in a water supply route when supplying water in a three-way stopcock for switching water supply and drainage.SOLUTION: The three-way stopcock 20 includes a valve element 31 provided with three-way passage 46 opened in three directions; and a cock body 32 for rotatably supporting the valve element 31 inside. When the valve element 31 is at a water supply position, two openings of an aqueduct 47 in the three-way passage 46 are communicated with first and second holes 41, 42 respectively. A branch route 48 in the three-way passage 46 flows pressurized gas for drainage and does not communicate with the first to third holes 41 to 43 at the water supply position. At the water supply position, a plunger 53 closes the third hole 43 airtightly and prevents the gas from entering the aqueduct 47 via the third hole 43. When the valve element 31 rotates at 180° and comes at a drainage position, and the opening of the branch route 48 communicates with the third hole 43, the plunger 53 releases the third hole 43.

Description

  The present invention relates to a liquid feeding device in which a stopcock is used to switch between liquid feeding and draining, and in particular, an endoscope water feeding device that feeds cleaning water or the like to an endoscope distal end portion in order to perform lens cleaning or the like. About.

  In general, the endoscope water supply device is configured to send cleaning water from the water supply tank to the endoscope distal end portion through the water supply conduit. The inside of the water supply tank is pressurized by sending pressurized air to the upper space of the stored water, and wash water is sent out by the pressurized air. Since cleaning water has accumulated in the water supply pipe after the completion of water supply, it is necessary to drain the cleaning water from the water supply pipe using pressurized air after completion of the inspection.

  Conventionally, in order to drain cleaning water, it is known that pressurized air in a tank is sent to a water supply pipe instead of cleaning water by a three-way cock arranged in an upper space in the tank ( For example, see Patent Document 1). The three-way stopcock has a T-junction valve body, a valve body that rotatably supports the inside, two holes that form part of the water supply path, and air supply for supplying pressurized air to the water supply path And a cock body having a hole.

Japanese Utility Model Publication No. 5-68501

  However, in general, the three openings of the T-junction are arranged on the same circumference with respect to the rotation axis, and there is a slight gap between the valve body and the cock body due to an accuracy error. Therefore, at the time of water supply, the pressurized air in the tank may be mixed into the water supply path through the air supply hole not communicating with the T-shaped path and the gap between the valve body and the cock body. If air is mixed into the cleaning water sent to the endoscope distal end, the objective lens cannot be sufficiently cleaned, and there is a risk of hindering subject observation and the like.

  Then, an object of this invention is to provide the stopcock which can prevent that air is mixed in the liquid supply path | route at the time of liquid feeding, and the liquid feeding apparatus which uses the cock.

  The liquid feeding device according to the present invention includes a valve body provided with a three-way passage opened in three directions, a valve body rotatably supported therein, and first and second parts forming part of the liquid feeding path. A stopcock having a path and a cock body provided with a third path, and two openings of the three-way passage communicate with the first and second paths, respectively, and the other opening is In a state where the valve element is arranged at the first position (liquid feeding position) not communicating with the first to third paths, the liquid feeding means for sending the liquid to the liquid feeding path and the stopcock are arranged at the first position. Then, the third path is hermetically closed, one opening of the three-way passage communicates with the third path, and at least one of the other two openings is at least one of the first and second paths. A shield that opens the third path when the valve element is disposed at the second position (drainage position) communicating with one side. With the door, through a third path which is opened, pressurized air is sent to the liquid supply path, liquid feed path inside the liquid, characterized in that it is discharged.

  At least a part of the shielding member is disposed inside the third path, and is pressed against the outer peripheral surface of the valve body so as to be relatively away from the rotation axis of the valve body and open the third path. preferable. Moreover, it is better that a part of the outer peripheral surface of the valve body is configured by a portion closer to the rotating shaft than other portions of the outer peripheral surface. In this case, when the adjacent portion is arranged at a position that coincides with the third path, the shielding member relatively approaches the rotation axis and hermetically closes the third path. However, a part of the outer peripheral surface of the valve body is provided with a first recess, and the shielding member should be inserted closer to the inside of the first recess and relatively closer to the rotation shaft. good.

  The liquid feeding device may include a spring member that biases the shielding member so as to approach the rotation axis. Moreover, the 2nd recessed part may be provided in the outer peripheral surface of a valve body. In this case, the shielding member is pressed against the outer peripheral surface of the valve body while part of the shielding member is inserted into the second recess, and is relatively away from the rotation shaft.

  A shielding member may be brought into close contact with the outer periphery of the opening constituting at least a part of the third path to close the third path. Moreover, it is preferable that a part of shielding member is arrange | positioned in the position which passes the inside of the hole and contacts the outer peripheral surface of a valve body.

  The liquid feeding device may include a cylinder having a bottom portion, and the shielding member may be a piston that is movably disposed inside the cylinder. It is preferable that a hole constituting at least a part of the third path is formed in the bottom of the cylinder, and the piston is brought into close contact with the bottom of the cylinder to close the third path. For example, a passage through which pressurized air passes is provided in the shielding member.

  The liquid feeding means is composed of, for example, a liquid feeding tank, and the liquid stored in the liquid feeding tank is pushed by the pressurized air inside the liquid feeding tank while one end of the liquid feeding path is disposed therein. Then, it is sent from one end to the liquid feeding path. The stopcock is preferably arranged under pressurized air, and particularly preferably arranged under pressurized air in the liquid feeding tank. Then, the pressurized air in the tank is sent to the liquid feeding path via the opened third path, and the liquid inside the liquid feeding path is discharged.

  A stopcock according to the present invention includes a valve body provided with a three-way passage opened in three directions, a valve body that rotatably supports the valve body, and a cock body provided with first to third paths, And a shielding member provided so as to close the path 3. In the shielding member, the valve body is arranged at the first position where the two openings of the three-way passage communicate with the first and second paths and the other opening does not communicate with the first to third paths. Then, the third path is hermetically closed. The shielding member includes a second one in which one opening of the three-way passage communicates with the third path and at least one of the other two openings of the three-way path communicates with at least one of the first and second paths. If a valve body is arrange | positioned in this position, a 3rd path | route will be open | released.

  In this invention, when a valve body is arrange | positioned in a liquid feeding position, the 3rd path | route used at the time of draining is airtightly obstruct | occluded. Therefore, even if there is a gap due to an accuracy error between the outer peripheral surface of the valve body and the inner peripheral surface of the cock body, the pressurized air is prevented from entering the gap from the third path during liquid feeding, Gas is less likely to be mixed into the liquid in the liquid feeding path.

It is the schematic which shows the air_supply / water supply apparatus for endoscopes. It is the schematic which shows a mode when the air / water supply button is pushed. It is sectional drawing which shows a three-way stopcock when a valve body is arrange | positioned in a water supply position. It is an expanded sectional view for showing a valve when a valve body is arranged in a water supply position. It is sectional drawing which shows a three-way stopcock when a valve body is arrange | positioned in the drainage position. It is an expanded sectional view for showing a valve when a valve element is arranged in a drainage position.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram showing an endoscopic air / water supply apparatus according to an embodiment of the present invention.
The air / water supply device 10 sends cleaning water from the air / water supply tank 11 via the water supply path 12 to the distal end portion (not shown) of the endoscope, and from the air / water supply tank 11 via the air supply path 13. It is a device for sending pressurized air to the mirror tip.

  The air / water tank 11 is a tank whose inside is sealed, and the wash water W is stored in the tank up to an arbitrary water level. A pump 15 is connected to the air / water supply tank 11, pressurized air is sent from the pump 15 to the space 16 above the wash water W inside the tank 11, and the inside of the tank 11 is atmospheric pressure by the pressurized air. Higher atmospheric pressure.

  A three-way cock 20 including a valve body 31 and a cock main body 32 that rotatably supports the valve body 31 is disposed in the space 16. One end of the valve body 31 in the direction of the rotation axis X (see FIG. 3) protrudes outside the tank 11, and a lever 33 is provided at one end thereof. In addition, an air / water supply button 17 is provided on an operation unit (not shown) of the endoscope.

  One end of the water supply path 12 is opened in the wash water stored in the tank 11, the other end is connected to the three-way stopcock 20, one end is connected to the three-way stopcock 20, and the other A second water supply conduit 22 whose end extends to the air / water supply button 17 and a third water supply conduit 23 extending from the air / water supply button 17 to the distal end of the endoscope are provided. One end of the air supply path 13 is opened in the space 16 inside the tank 11 and the other end extends to the air supply / water supply button 17, and the distal end portion of the endoscope from the air supply / water supply button 17. And a second air supply duct 25 extending to the end.

  The air / water supply button 17 includes an air supply connection path 26 that allows communication between portions located on opposite sides of the button side portion, and a branch passage 27 that branches from the air supply connection path 26 and opens to the button top portion 17T. And the water supply connection path 28 which connects between the parts located in the mutually opposite side of a button side part is provided so that it may not connect to the air supply connection path 26 or the branch passage 27.

  As shown in FIG. 1, in a state where the button 17 is not pressed, the first and second air supply conduits 24 and 25 communicate with each other via the air supply connection passage 26 and the second and third water supply conduits 22 and 23. Are not communicated by the water supply connection path 28, and the water supply path 12 is blocked by the button 17. On the other hand, as shown in FIG. 2, in the state where the button 17 is pressed, the second and third water supply pipes 22 and 23 are communicated by the water supply connection path 28, the water supply path 12 is opened, and the first The second air supply pipes 24 and 25 are not communicated with each other by the air supply connection path 26, and the air supply path 13 is blocked by the button 17.

  In a state where the air / water supply button 17 is not pressed and the top portion 17T is not pressed by the finger, the pressurized air sent from the air / water supply tank 11 passes through the branch passage 27 in the air / water supply button 17 and reaches the top portion. The atmosphere is released from 17T. At this time, a check valve (not shown) provided in the second air supply conduit 25 and the like is closed, and natural air supply to the distal end portion of the endoscope is blocked by the check valve. Further, as shown in FIG. 1, when the air / water supply button 17 is not pressed but the top is blocked by a finger or the like, the pressurized air opens the check valve and supplies air from the air / water supply tank 11. It is sent to the distal end of the endoscope via the air path 13. The pressurized air is ejected from an air supply nozzle (not shown) provided at the distal end portion of the endoscope.

  On the other hand, as shown in FIG. 2, when the air / water supply button 17 is pressed, the air supply path 13 is blocked and the water supply path 12 is opened as described above. Therefore, the cleaning water W inside the tank 11 to which the pressure is applied by the pressurized air in the space 16 is sent to the endoscope distal end portion via the water supply path 12. Washing water is ejected from a water supply nozzle provided at the distal end portion of the endoscope to wash the objective lens and the like.

  In the three-way cock 20, the valve body 31 is rotated by operating the lever 33. The valve body 31 is rotated and arranged at a water supply position (first position), a drainage position (second position), etc., and switching from the water supply position to the drainage position is performed by rotating the valve body 31 180 degrees. Is done by. Here, when the valve body 31 is disposed at the water supply position, the first and second water supply pipes 21 and 22 are communicated with each other by the water supply path 47 (see FIG. 3) of the three-way stopcock 20, and air is supplied as described above. When the water supply button 17 is pressed, the water in the tank 11 is supplied to the distal end portion of the endoscope. On the other hand, at the drainage position, the pressurized air in the space 16 flows from the three-way cock 20 into the water supply path 12, and the cleaning water accumulated in the water supply path 12 is drained. In addition, drainage of the water supply path 12 is normally performed when the button 17 is pushed and the second and third water supply pipelines 22 and 23 are communicated with each other through the water supply connection path 28.

  Next, the three-way cock will be described in more detail. FIG. 3 shows the three-way stopcock when the valve body is arranged at the water supply position. As shown in FIG. 3, the cock main body 32 of the three-way cock 20 is a cylindrical cylinder provided with first to third holes 41 to 43 penetrating in a radial direction. The first and second holes 41 and 42 are connected to the first and second water supply pipes 21 and 22 via connection pipes 44 and 44, respectively. That is, the first and second holes 41 and 42 together with the connecting pipes 44 and 44 constitute a part of the water supply path 12 as the first and second paths.

  The first to third holes 41 to 43 are arranged on the same circumference around the rotation axis X in the cock main body 32. The third hole 43 is arranged at a position shifted by 90 ° from the first hole 41 when viewed from the rotation axis X. The second hole 42 is disposed at a position further shifted by 90 ° from the third hole 43, and is disposed on the opposite side of the first hole 41 across the rotation axis X.

  A three-way passage 46 opened in three directions is provided inside the valve body 31 so as to communicate with the first to third holes 41 to 43. The three-way passage 46 is opened in two directions by a water supply passage 47 penetrating in the radial direction, and is formed by two branch passages 48 and 48 that are branched at right angles and in the same direction from the middle of different positions of the water supply passage 47. The other one is opened. These openings of the three-way passage 46 are arranged at positions corresponding to the first to third holes 41 to 43 in the rotation axis X direction.

  The valve body 31 is formed in a substantially columnar shape so that the cylindrical cock main body 32 is fitted therein, but a part of the outer peripheral surface 31A is recessed from the other parts, and the first and second parts. The recesses 49 and 50 are formed. That is, the outer peripheral surface 31A of the valve body 31 is on a virtual circumferential surface R having the same diameter centered on the rotation axis X, but in part, the virtual circumferential surface 31A is formed by the recesses 49 and 50. It is arranged closer to the rotation axis X side than the surface R.

  The second concave portion 50 is disposed between the branch paths 48 and 48 and is disposed at a position shifted from the rotation axis X by 90 ° with respect to each of the two openings of the water supply path 47. The first recess 49 is disposed on the opposite side of the second recess 50 across the rotation axis X. The first and second recesses 49 and 50 are partially recessed at a position that coincides with the opening of the three-way passage 46 in the axial direction X, but penetrates in the rotational axis X direction of the valve body 31 and extends in the axial X direction. The whole in may be recessed.

  A valve 51 is attached to the cock body 32 of the three-way cock 20. The valve 51 includes a valve cylinder 52 connected to the third hole 43, a columnar valve piston 53 disposed inside the valve cylinder 52, and a lid portion 54 that closes the opening on the rear end side of the valve cylinder 52. Prepare. The axis Y of the valve piston 53 coincides with the radial direction of the valve body 31, and the piston 53 can move along the radial direction (axis Y direction) of the valve body 31 inside the cylinder 52.

  A male screw portion is provided on the outer peripheral surface of the distal end side of the valve cylinder 52, and a female screw portion is provided on the inner peripheral surface of the third hole 43. The valve cylinder 52 has a third hole on the front end side. 43 is screwed in an airtight manner. The valve cylinder 52 has a substantially bottomed cylindrical shape having a bottom 52A on the tip side. A hole 52B is formed in the center of the bottom 52A, and the third hole 43, the hole 52B, and the inside of the cylinder 52 are communicated to form a third path for allowing pressurized air to flow into the valve body 31. To do.

  As shown in FIG. 4, the valve piston 53 includes a cylindrical large-diameter portion 61, a column-shaped midway portion 62 continuously provided on the distal end side of the large-diameter portion 61, and a connecting portion on the distal end side of the midway portion 62. The head portion 64 that is connected to the piston 53 and is connected to the rear end side of the large-diameter portion 61, and the columnar small-diameter portion 66 that forms the rear end of the piston 53 is integrated. Configured. The outer peripheral surface of the large-diameter portion 61 is connected to the outer peripheral surface of the small-diameter portion 66 through a step portion 65 that is an orthogonal surface orthogonal to the axis Y.

  The outer diameter of the large diameter portion 61 is substantially equal to the inner diameter of the valve cylinder 52, and the piston 53 can slide in the axial direction while bringing the outer peripheral surface of the large diameter portion 61 into contact with the inner peripheral surface of the cylinder 52. The outer diameter of the midway portion 62 is smaller than the outer diameter of the large diameter portion 61, and a small gap is formed between the outer peripheral surface of the midway portion 62 and the inner peripheral surface of the cylinder 52. The diameter of the connection portion 63 gradually decreases toward the tip, and the outer peripheral surface is tapered. An annular groove 68 is formed on the outer peripheral surface of the connecting portion 63, and an annular seal member 67 is disposed inside the annular groove 68. The seal member 67 is an O-ring formed from an elastic material such as rubber, and may be lined. The head 64 is formed by connecting a dome-shaped tip to a cylinder having an outer diameter smaller than the outer diameter of the midway portion 62.

  The center of the valve piston 53 extends along the axis Y and communicates with a first passage 71 whose rear end opens at the rear end surface of the piston 53 and a front end of the first passage 71. There is provided a T-junction 70 defined by a second passage 72 that crosses. Both end portions of the second passage 72 open to the outer peripheral surface of the midway portion 62.

  The inner surface of the bottom portion 52 </ b> A of the valve cylinder 52 is tapered corresponding to the outer peripheral surface of the connection portion 63 and faces the outer peripheral surface of the connection portion 63. The head portion 64 of the piston 53 is passed through the inside of the hole 52B of the bottom portion 52A, and its tip protrudes forward (rotation axis X side) from the bottom portion 52A. The lid portion 54 includes a bottom surface portion 54B provided with a hole 54A in the center, and a cylindrical portion 54C provided continuously with one surface of the bottom surface portion 54B and provided with a female screw portion on the inner peripheral surface. A male thread portion is provided on the outer periphery of the rear end portion of the cylinder 52. The lid portion 54 is fixed to the cylinder 52 by screwing the cylindrical portion 54 </ b> C to the rear end portion of the piston 53. The rear end of the small diameter portion 66 of the valve piston 53 passes through the hole 54A and protrudes rearward from the bottom surface portion 54B.

  A coil spring 73 is disposed in the gap between the outer peripheral surface of the small diameter portion 66 and the inner peripheral surface of the valve cylinder 52. The coil spring 73 is compressed by being sandwiched between the bottom surface portion 54B and the stepped portion 65, and biases the valve piston 53 forward (that is, close to the rotation axis X) by the spring force.

  3 and 4, the two openings of the water supply passage 47 communicate with the first and second holes 41 and 42 (first and second routes) and the openings of the branch passages 48 and 48. Is positioned on the opposite side of the third hole 43 (third path) across the rotation axis X. Therefore, when the air supply / water supply button 17 is pushed when the valve body 31 is disposed at the water supply position, the wash water sent from the air supply / water supply tank 11 passes through the water supply passage 47 as described above. Sent to the mirror tip. Further, since the openings of the branch passages 48 and 48 are blocked by the inner peripheral surface of the cock main body 32 and do not communicate with the first to third holes 41 to 43, the wash water flows from the branch passages 48 and 48 to the three-way stopcock. There is no leakage outside the 20.

  In the water supply position, as shown in FIGS. 3 and 4, the first recess 49 is disposed at a position that coincides with the third hole 43 and faces the hole 52 </ b> B. The 1st recessed part 49 has a magnitude | size which can accommodate the front-end | tip of the head 64 in the inside. Therefore, the valve piston 53 has its tip (the tip of the head 64) exceeding the virtual circumferential surface R by the spring force of the coil spring 73 and the pressure of the pressurized air in the tank 11, and the first recess. 49. That is, the valve piston 53 is disposed so as to be relatively close to the rotation axis X when the valve body 31 is disposed at the water supply position.

  The valve piston 53 is pressed by the spring force or the like, with the outer peripheral surface of the connecting portion 63 being in close contact with the inner surface of the bottom portion 52A via the seal member 67. That is, the valve piston 53 is airtightly adhered to the entire circumference of the opening outer peripheral portion of the hole 52B, and the hole 52B (that is, the third path) of the cylinder 52 is airtightly closed. Therefore, when the valve body 31 is arranged at the water supply position, the air outside the three-way cock 20 is sent to the gap between the midway portion 62 and the cylinder 52 via the T-shaped path 70, but passes through the hole 52B. The third hole 43 does not flow into the third hole 43.

  3 and 4, there is a slight gap between the inner surface of the recess 49 and the outer peripheral surface of the head portion 64, and the valve body 31 does not contact the head portion 64. Therefore, the valve body 31 does not press the valve piston 53 away from the rotation axis X when in the water supply position. Moreover, the 1st recessed part 49 is formed in the gentle curve in the circumferential direction so that the valve body 31 can be rotationally moved from the state (water supply position) of FIG.

  On the other hand, when the valve body 31 is rotated 180 ° from the water supply position and disposed at the drainage position shown in FIGS. 5 and 6, the two openings of the water supply passage 47 communicate with the first and second holes 41 and 42. In addition, the openings of the branch paths 48 and 48 are communicated with the third hole 43. Further, the tip of the head 64 is disposed on the second recess 50.

  The second recess 50 is sufficiently smaller than the first recess 49 in at least the circumferential direction. Therefore, only the apex portion 64 </ b> A of the head portion 64 is inserted into the second recess 50, and the other portions are disposed outside the virtual circumferential surface R. That is, when the valve body 31 is rotated 180 ° and switched from the water supply position to the drainage position, the head 64 is pressed against the outer peripheral surface 31A of the valve body 31 and is relatively away from the rotation axis X. Therefore, the piston 53 is separated from the inner surface of the bottom 52A, and the hole 52B (that is, the third path) is opened.

  Therefore, when the valve body 31 is in the drainage position, the pressurized air inside the tank 11 (see FIG. 1) passes through the T-shaped path 70, the hole 52B, the third hole 43, and the branch paths 48 and 48. It is sent to the water supply path 12 communicated by the water supply path 47 and the water in the water supply path 12 is drained. At the drainage position, the openings of the branch passages 48 and 48 are opposed to the gap between the inner peripheral surface of the hole 52B and the outer peripheral surface of the head 64, so that the pressurized air flows into the branch passages 48 and 48. It becomes easy to flow in.

  As described above, in the present embodiment, when the valve body 31 is disposed at the water supply position, the third hole 43 (third path) is airtightly closed by the valve piston 53. Therefore, even if there is a gap due to an accuracy error between the outer peripheral surface of the valve body 31 and the inner peripheral surface of the cock main body 32, it is possible to prevent pressurized air from entering the gap through the third hole 43. Is done. Therefore, it becomes difficult for air to be mixed into the cleaning water that passes through the water supply passage 47 and is sent to the distal end portion of the endoscope.

  On the other hand, when the valve body 31 is disposed at the drainage position, the valve piston 53 is retracted by the pressure of the valve body 31, and the third hole 43 (third path) is opened. Therefore, the inflow of pressurized air when draining is not hindered by the valve histone 53.

  Further, when the valve body 31 is rotated and switched to the drainage position shown in FIGS. 5 and 6, the apex portion 64 </ b> A of the piston 53 is brought into contact with the outer peripheral surface 31 </ b> A on the virtual circumferential surface R from the coil spring 73. It slightly enters radially inward due to spring force or the like. Therefore, when the valve body 31 is rotated to the state shown in FIGS. 5 and 6, the spring 73 is extended, the spring force applied to the valve body 31 via the piston 53 is reduced, and a click stop feeling is obtained. Thereby, the valve body 31 is easily stopped in the state shown in FIGS. 5 and 6 and is easily maintained in that state.

  Similarly, when the valve body 31 is rotated to the state shown in FIGS. 3 and 4 (water supply position), the piston 53 does not come into contact with the valve body 31, so the spring force applied to the valve body 31 becomes zero. Therefore, a click stop feeling can be obtained in the same manner when the water supply state shown in FIGS.

  In the present embodiment, the first and second concave portions 49 and 50 are provided on the outer peripheral surface of the valve body 31, but convex portions may be provided instead of the concave portions 49 and 50. At this time, the convex portion is arranged at a position where the second concave portion 50 is provided. And if the valve body 31 is arrange | positioned in a drainage position, the piston 53 will be pressed by the convex part, and will move relatively away from the rotating shaft X, and will open | release a 2nd path | route. On the other hand, when the valve body 31 is disposed at other positions including the water supply position, the piston 53 is not pressed by the valve body 31 and relatively approaches the rotation axis X side, and the third path is hermetically closed. It will be. When the convex portion is provided, the cock main body 32 is provided with a groove for inserting the convex portion.

  In the present embodiment, two branch paths 48 are provided. However, if the opening communicates with the third hole 43 (third path) at the drainage position, there is only one. However, it may be three or more. In the case where there are a plurality of branch paths 48, the openings are preferably arranged so as to surround the second recess 50.

  Furthermore, when the valve body 31 is in the drainage position, both of the two openings of the water supply passage 47 are communicated with the first and second paths (first and second holes 41 and 42). Only one of the openings may be communicated with the first or second path.

10 Endoscope air / water supply device (Endoscope liquid supply device)
12 Water supply route (liquid supply route)
DESCRIPTION OF SYMBOLS 13 Air supply path 20 Three-way cock 31 Valve body 32 Cock main body 41-43 1st-3rd hole 46 Three-way channel | path 49, 50 1st and 2nd recessed part 52 Valve cylinder 52A Bottom part 52B Hole 53 Valve piston (shielding member)
73 Coil spring (spring member)

Claims (14)

A valve body provided with a three-way passage opened in three directions, a first and second paths that form a part of a liquid feeding path, and a third path that rotatably support the valve body inside. A stopcock having a cock body provided with
Each of the two openings of the three-way passage communicates with the first and second paths, and the other opening is in the first position not communicating with the first to third paths. In a state where the body is arranged, a liquid feeding means for sending a liquid to the liquid feeding path;
When the stopcock is disposed at the first position, the third path is hermetically closed, one opening of the three-way passage communicates with the third path, and the other two openings A shielding member that opens the third path when the valve body is disposed at a second position where at least one of the first and second paths communicates with at least one of the first path and the second path,
Via the opened third path, pressurized air is sent to the liquid feeding path, and the liquid inside the liquid feeding path is discharged.   The shielding member is disposed at least partially inside the third path, is pressed against the outer peripheral surface of the valve body, and is relatively away from the rotation axis of the valve body, and the third path The liquid feeding device according to claim 1, wherein the liquid feeding device is opened. A part of the outer peripheral surface of the valve body is configured with a portion closer to the rotating shaft than other portions of the outer peripheral surface,
When the adjacent portion is disposed at a position that coincides with the third path, the shielding member relatively approaches the rotation axis and hermetically closes the third path. The liquid feeding device according to claim 2. A part of the outer peripheral surface of the valve body is provided with a first recess,
4. The liquid feeding device according to claim 3, wherein a part of the shielding member is inserted into the first recess and relatively approaches the rotation shaft. 5.   The liquid feeding device according to claim 3, further comprising a spring member that biases the shielding member so as to approach the rotating shaft. The outer peripheral surface of the valve body is provided with a second recess,
3. The liquid feeding device according to claim 2, wherein a part of the shielding member is pressed into the outer peripheral surface while being partially inserted into the second recess, and is relatively away from the rotation shaft. .   2. The liquid feeding device according to claim 1, wherein the shielding member is brought into close contact with an opening outer peripheral portion of a hole constituting at least a part of the third path to close the third path. .   The liquid feeding device according to claim 7, wherein a part of the shielding member is disposed at a position that contacts the outer peripheral surface of the valve body through the inside of the hole. Comprising a cylinder having a bottom,
The shielding member is a piston movably disposed inside the cylinder,
The liquid feeding device according to claim 7, wherein the hole is formed in the bottom portion, the piston is brought into close contact with the bottom portion of the cylinder, and the third path is closed.   The liquid feeding device according to claim 1, wherein a passage through which the pressurized air passes is provided inside the shielding member.   The liquid feeding device according to claim 1, wherein the stopcock is disposed under pressurized air. The liquid feeding means is composed of a liquid feeding tank,
The liquid stored in the liquid feeding tank has one end of the liquid feeding path disposed therein, and is pushed by the pressurized air inside the liquid feeding tank and sent from the one end to the liquid feeding path. The liquid feeding device according to claim 1, wherein:   The stopcock is disposed under pressurized air in the liquid feeding tank, and the pressurized air in the tank is sent to the liquid feeding path through the opened third path, and the liquid feeding path The liquid feeding device according to claim 12, wherein the liquid inside is discharged. A valve body provided with a three-way passage opened in three directions;
A cock body that rotatably supports the valve body and provided with first to third paths;
A shielding member provided so as to block the third path,
The shield member is configured such that each of the two openings of the three-way passage communicates with the first and second paths and the other opening does not communicate with the first to third paths. Is disposed, the third path is hermetically closed, one opening of the three-way passage communicates with the third path, and at least one of the other two openings of the three-way path A stopcock, wherein the third path is opened when the valve element is disposed at a position communicating with at least one of the first and second paths.

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