Water stop valve

Abstract

To provide a water stop valve which can open and close an inner flow path with a smaller force when an open / close mechanism for opening and closing the inner flow path includes a rotation disk and a fixed disk.SOLUTION: A water stop valve 1 includes a sliding contact surface 70 that is in slide contact with a rotation disk 44, the rotation disk 44, a fixed disk 42, an elastic member 43, and a support part 41, which are arranged in this order from an upstream to a downstream in a water circulation direction G. Thus, a pressure applied by the water flown into the water stop valve 1 to a rotation disk side closing part 54 of the rotation disk 44 and the fixed disk 42 acts in a direction of compressing the elastic member 43 interposed between the fixed disk 42 and the support part 41 in a Z-axis direction. With this configuration, a friction force between the rotation disk 44 and the sliding contact surface 70 of a separation restriction member 45 is decreased compared to the case where the water pressure is not applied. Thus, the water stop valve 1 can open and close an inner flow path 23a with a smaller force.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a stop valve in which an opening / closing mechanism for opening and closing an internal flow path is provided with a rotating disc and a fixed disc. [Background technology]

[0002] A stop valve that can open and close a flow path with less force than a ball stop valve is described in Patent Document 1. The stop valve in this document includes a housing having a primary pipe portion with a primary flow path, a secondary pipe portion with a secondary flow path, and a communicating portion with an internal flow path that connects the primary flow path and the secondary flow path; a spindle rotatably supported by the housing, with a protruding portion on one axial side that protrudes into the internal flow path and an exposed portion on the other axial side that is exposed to the outside of the housing; and an opening / closing mechanism that opens and closes the internal flow path. The opening / closing mechanism includes a rotating disk connected to the protruding portion and rotating integrally with the spindle, and a fixed disk fixed within the internal flow path and in surface contact with the rotating disk. The fixed disk includes a sealing portion that seals the internal flow path and an opening provided in a portion of the sealing portion in the circumferential direction. The rotating disk has a communicating port that overlaps with the opening when positioned at a first angular position around the spindle axis and overlaps with the sealing portion when positioned at a second angular position different from the first angular position. The fixed and rotating discs are made of ceramic.

[0003] The stop valve in this document rotates the rotating disc by rotating the spindle, allowing water to pass through by aligning the opening of the fixed disc with the communication port of the rotating disc, and stops water by aligning the sealing portion of the fixed disc with the communication port of the rotating disc. The fixed and rotating discs are made of ceramic and have high hardness. Therefore, compared to ball stop valves, in which a metal valve body slides against two plastic or rubber valve seats when opening and closing the internal flow path, friction between the fixed and rotating discs when opening and closing the internal flow path can be reduced. Therefore, the stop valve in this document requires less force to open and close the internal flow path than a ball stop valve. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2023-83845 Summary of the Invention [Problem to be solved by the invention]

[0005] It is desirable to provide a stop valve that can open and close the internal flow path with less force, even when the opening and closing mechanism for opening and closing the internal flow path includes a rotating disk and a fixed disk. [Means for solving the problem]

[0006] In order to solve the above problems, the stop valve of the present invention comprises a housing having a primary-side pipe portion having a primary-side flow path, a secondary-side pipe portion having a secondary-side flow path, and a communicating portion having an internal flow path that communicates the primary-side flow path and the secondary-side flow path, a spindle that is rotatably supported by the housing and has a protruding portion that protrudes into the internal flow path on one side in the axial direction and an exposed portion that is exposed to the outside of the housing on the other side, and an opening / closing mechanism that opens and closes the internal flow path, the opening / closing mechanism comprising: an annular support portion that is provided in the communicating portion and surrounds the internal flow path, a fixed disk whose outer periphery is supported by the support portion, a rotating disk that is connected to the protruding portion and rotates integrally with the spindle and that comes into surface contact with the fixed disk from the side opposite to the support portion, an annular elastic member that is compressed in the axial direction and is interposed between the fixed disk and the support portion, and a rotating disk that is attached to the housing in a state that it cannot rotate about the axis. a separation restriction member that prevents the rotating disk from separating from the fixed disk in the axial direction, the separation restriction member having a sliding surface that contacts the rotating disk from the side opposite to the fixed disk, the fixed disk being made of ceramic and having a fixed disk side sealing portion that seals the internal flow path and an opening provided in a portion of the circumferential direction of the fixed disk side sealing portion, the rotating disk having a rotating disk side sealing portion that contacts the fixed disk side sealing portion and an opening provided in a portion of the circumferential direction of the rotating disk side sealing portion The rotating disk has a communication port that overlaps with the opening when positioned at a first angular position around the axis of the spindle and that overlaps with the fixed disk side sealing portion when positioned at a second angular position different from the first angular position, and the portion that comes into contact with the fixed disk is made of ceramic, and the sliding surface, the rotating disk, the fixed disk, the elastic member, and the support portion are arranged in this order from upstream to downstream in the flow direction of water that flows from the primary side flow path to the secondary side flow path via the internal flow path.

[0007] According to the present invention, the stop valve includes a separation restriction member that prevents the rotating disc from separating axially from the fixed disc. This prevents water from leaking between the rotating disc and the fixed disc. The stop valve also includes an annular elastic member that is axially compressed and interposed between the fixed disc and the support portion. This prevents water from leaking between the fixed disc and the support portion of the housing.

[0008] When the rotating disc is rotated to allow or stop water flow, the rotating disc is subjected to the pressure (water pressure) exerted on the rotating disc-side sealing portion by the water flowing into the stop valve, the frictional force between the rotating disc and the fixed disc, and the frictional force between the rotating disc and the sliding surface of the separation restriction member. In the present invention, the fixed disc and the portion of the rotating disc that contacts the fixed disc are made of ceramic and have high hardness. Therefore, compared to when a metal valve body, such as a ball valve body, slides between two resin or rubber valve seats, friction when the rotating disc slides against the fixed disc can be reduced. Therefore, according to the present invention, the stop valve can be opened and closed with less force than when opening and closing a ball stop valve. Furthermore, in the present invention, the sliding surface of the separation restriction member against which the rotating disc slides, the rotating disc, the fixed disc, the elastic member, and the support portion are arranged in this order from upstream to downstream in the water flow direction. Therefore, the pressure exerted by water flowing into the stop valve on the rotating disc's closing portion presses the rotating disc and fixed disc against the support portion via the elastic member. That is, the pressure of water flowing into the stop valve acts in a direction that axially compresses the elastic member interposed between the fixed disc and the support portion. This reduces the elastic return force of the axially compressed elastic member that presses the rotating disc against the sliding surface via the fixed disc. Therefore, the frictional force between the rotating disc and the sliding surface of the separation restriction member is reduced compared to when such water pressure is not applied. Therefore, the stop valve of the present invention allows the internal flow path to be opened and closed with less force.

[0009] In the present invention, the sliding surface is provided in an annular shape centered on the axis, and the rotating disk has protrusions extending circumferentially around the axis on both sides of the protrusion on an opposing surface facing the sliding surface, the protrusions respectively extending in the circumferential direction around the axis, and the end faces of each protrusion in the axial direction are rotating disk-side sliding surfaces that slide against the sliding surface. This reduces the area of ​​contact between the rotating disk-side sliding surface and the sliding surface of the separation restriction member. Therefore, it is easy to reduce the friction force between the rotating disk and the sliding surface of the separation restriction member.

[0010] In the present invention, the plurality of protrusions are spaced apart in the circumferential direction, the sliding surface has a protrusion that protrudes between two of the protrusions that are adjacent in the circumferential direction, and the rotating disk rotates within a rotation angle range in which the protrusion moves relatively between the two of the protrusions that are adjacent in the circumferential direction. In this way, the protrusions provided on the sliding surface of the separation restriction member and the two protrusions on the rotating disk that sandwich the protrusions in the circumferential direction allow the rotating disk to rotate around its axis. The rotation angle range can be specified.

[0011] In the present invention, the opening / closing mechanism may include a rotation restriction mechanism that restricts rotation of the fixed disk around the axis. In the present invention, the fixed disk is supported on a support portion via an elastic member. Furthermore, the pressure of water flowing into the stop valve acts in a direction that presses the fixed disk against the support portion. Therefore, when the rotating disk rotates, the fixed disk is prevented or suppressed from rotating together with the rotating disk. However, if the opening / closing mechanism includes a rotation restriction mechanism, the fixed disk can be reliably prevented from rotating together with the rotating disk.

[0012] In the present invention, the fixed disk and the rotatable disk have circular contours, the fixed disk and the rotatable disk are arranged coaxially, a first outer diameter dimension of the fixed disk is larger than a second outer diameter dimension of the rotatable disk, the fixed disk has a locking recess recessed in the axial direction in an outer peripheral region located on the outer peripheral side of the rotatable disk when viewed from the axial direction, the separation restriction member has a locking protrusion protruding in the axial direction from the outer peripheral side of the sliding surface and locked in the locking recess, and the rotation restriction mechanism includes the separation restriction member and the locking protrusion. In this way, the rotation restriction mechanism can be provided using the separation restriction member.

[0013] In the present invention, an electric actuator may be provided that is fixed to the housing and connected to the exposed portion, and the actuator may rotate the spindle. In this way, the stop valve can be opened and closed by driving the actuator.

[0014] The stop valve of the present invention can be opened and closed with a relatively small force. Therefore, according to the present invention, the stop valve can be opened and closed even if the torque required for the actuator to rotate the spindle is small. Therefore, the actuator can be equipped with a battery as a power source. [Effects of the Invention]

[0015] According to the present invention, in a stop valve that opens and closes an internal flow path using a rotating disc and a fixed disc, the internal flow path can be opened and closed with a smaller force. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 2 is a cross-sectional view of the stop valve in a water-passing state. [Figure 2] FIG. 2 is an exploded perspective view of the stop valve as viewed from one side in the axial direction of the spindle. [Figure 3] 10 is an exploded perspective view of the stop valve as viewed from the other side in the axial direction of the spindle. FIG. [Figure 4] FIG. 10 is an explanatory diagram of the opening and closing mechanism in a water-passing state. [Figure 5] FIG. 10 is an explanatory diagram of the opening and closing mechanism in a water-stopped state. DETAILED DESCRIPTION OF THE INVENTION

[0017] A stop valve according to an embodiment of the present invention will be described below with reference to the drawings.

[0018] Fig. 1 is a cross-sectional view of the stop valve in a water-passing state. Fig. 2 is an exploded perspective view of the stop valve as viewed from one side in the axial direction of the spindle. Fig. 3 is an exploded perspective view of the stop valve as viewed from the other side in the axial direction of the spindle. Fig. 4 is an explanatory diagram of the opening and closing mechanism in a water-passing state. Fig. 5 is an explanatory diagram of the opening and closing mechanism in a water-stopped state. Figs. 4 and 5 show the fixed disc and the rotating disc as viewed from the Z2 direction.

[0019] As shown in FIG. 1, the stop valve 1 of this example is installed between a primary pipe 2 and a secondary pipe 3 that are laid in a straight line. The stop valve 1 has a stop valve body 5 and an electric actuator 6 attached to the stop valve body 5. The stop valve body 5 has a housing 8 and a and a spindle 10 having an exposed portion 9 exposed to the outside from the spindle 10. The spindle 10 extends in a direction perpendicular to the primary piping 2 and the secondary piping 3.

[0020] The actuator 6 is fixed to the housing 8 and connected to the exposed portion 9 of the spindle 10. The actuator 6 includes a battery 15 as a power source. The battery 15 is a dry cell battery or a rechargeable secondary battery. The actuator 6 also includes a drive unit 16 such as a motor that is driven by the power source. The actuator 6 rotates the spindle 10 around its axis. The actuator 6 also includes a communication unit 17 that communicates with external devices.

[0021] In this example, a drive signal for driving the actuator 6 is input to the actuator 6 from an external device via wireless communication. The actuator 6 rotates the spindle 10 by 90° every time the drive signal is input. The drive signal may also be input to the actuator 6 from a device connected by wire. Alternatively, the actuator 6 may be provided with a drive switch that inputs a drive signal to the actuator 6, and the spindle 10 may be rotated by 90° every time the drive switch is operated.

[0022] In the following description, the axial direction along the axis L of the spindle 10 is referred to as the Z-axis direction. Two directions perpendicular to the Z-axis direction are referred to as the X-axis direction and the Y-axis direction. The X-axis direction is the direction along the primary piping 2 and the secondary piping 3. In the Z-axis direction, the side where the stop valve main body 5 is located is referred to as the Z1 direction, and the side where the actuator 6 is located is referred to as the Z2 direction. In the X-axis direction, the side connected to the primary piping 2 is referred to as the X1 direction, and the side connected to the secondary piping 3 is referred to as the X2 direction. In the following description, the direction in which water flows through the stop valve 1 (stop valve main body 5) is referred to as the water flow direction G.

[0023] The housing 8 includes a primary pipe section 21 connected to the primary piping 2, a secondary pipe section 22 connected to the secondary piping 3, and a communication section 23 located between the primary pipe section 21 and the secondary pipe section 22. The primary pipe section 21 includes a primary flow path 21a therein. The secondary pipe section 22 includes a secondary flow path 22a therein. The communication section 23 includes an internal flow path 23a that communicates the primary flow path 21a and the secondary flow path 22a. The internal flow path 23a extends in the Z-axis direction. The communication section 23 is provided with an opening / closing mechanism 24 that opens and closes the internal flow path 23a.

[0024] The primary-side pipe section 21 extends linearly in the X1 direction from the communicating section 23. The secondary-side pipe section 22 includes a curved pipe section 25 that curves in the Z2 direction from the Z1-direction end portion of the communicating section 23 toward the X2 direction, and an extended pipe section 26 that extends linearly in the X2 direction from the Z2-direction end portion of the curved pipe section 25. The primary-side pipe section 21 and the extended pipe section 26 are coaxial.

[0025] Here, the housing 8 includes a main body member 31 and a lid member 32 that covers the main body member 31 from the Z2 direction. The main body member 31 includes cavities corresponding to the primary flow path 21a, the secondary flow path 22a, and the internal flow path 23a. The main body member 31 also includes an opening 30 that communicates with the cavities. The opening 30 is provided at the end of the main body member 31 in the Z2 direction. The lid member 32 covers the main body member 31 and covers the opening 30. The lid member 32 is fastened to the main body member 31 with four bolts 34 and forms the end portion of the communication portion 23 in the Z2 direction. This defines the internal flow path 23a inside the communication portion 23. A packing 33 is interposed between the main body member 31 and the lid member 32.

[0026] As shown in FIG. 2, the cover member 32 has a support portion 35 in its central portion that rotatably supports the spindle 10. Also, as shown in FIG. 3, the cover member 32 has an annular portion 36 that protrudes in the Z1 direction on the outer periphery of the support portion 35. Four locking grooves 37 that extend radially are provided on the end surface of the annular portion 36 in the Z2 direction. The locking grooves 37 are formed at equal angular intervals. The annular portion 36 is inserted into the opening 30 of the body member 31 .

[0027] 1, the spindle 10 is supported by a support portion 35 and passes through the cover member 32 in the Z-axis direction. As a result, the spindle 10 has an exposed portion 9 exposed from the housing 8 in the Z2 direction at its end in the Z2 direction, and a protruding portion 11 protruding into the internal flow path 23a at its end in the Z1 direction. An actuator 6 is fixed to the cover member 32 on the side opposite to the main body member 31. A drive portion 16 of the actuator 6 is connected to the exposed portion 9.

[0028] The opening / closing mechanism 24 includes an annular support portion 41 provided in the communication portion 23 and surrounding the internal flow path 23a, a fixed disk 42 supported by the support portion 41, an annular elastic member 43 interposed between the fixed disk 42 and the support portion 41, and a rotating disk 44 in surface contact with the fixed disk 42 from the side opposite the support portion 41. The rotating disk 44 is coaxially connected to the protruding portion 11. The rotating disk 44 rotates integrally with the spindle 10. The opening / closing mechanism 24 also includes a separation restriction member 45 that contacts the rotating disk 44 from the side opposite the fixed disk 42 to prevent the rotating disk 44 from separating from the fixed disk 42, and a rotation restriction mechanism 46 (see FIG. 3) that prevents the fixed disk 42 from rotating around the axis of the spindle 10.

[0029] The support part 41 is provided midway in the Z-axis direction of the internal flow path 23a. The elastic member 43 is a packing. The elastic member 43 is made of, for example, silicone rubber. The elastic member 43 is held in an annular groove 47 provided on the end surface of the support part 41 in the Z2 direction.

[0030] The fixed disk 42 is made of ceramic. As shown in FIG. 2, the fixed disk 42 has a circular outline when viewed in the Z-axis direction. As shown in FIG. 4, the fixed disk 42 has a first outer diameter D1 that is larger than the inner diameter of the support portion 41. Therefore, as shown in FIG. 1, the fixed disk 42 has its outer peripheral edge supported by the support portion 41 via the elastic member 43. The Z2-direction end face of the fixed disk 42 is a smooth surface. As shown in FIG. 2, the outer peripheral edge of the Z2-direction end face of the fixed disk 42 is provided with a plurality of locking recesses 48 recessed in the Z1 direction. The locking recesses 48 are notches formed by cutting out the outer peripheral edge of the Z2-direction end face of the fixed disk 42 from the Z2 direction. In this example, four locking recesses 48 are provided at equal angular intervals.

[0031] The fixed disk 42 includes a fixed-disk-side sealing portion 49 that seals the internal flow path 23a, and a pair of openings 50 provided at two locations around the circumferential direction of the fixed-disk-side sealing portion 49. When viewed from the Z-axis direction, each opening 50 has a fan shape that widens toward the outer periphery. The pair of openings 50 are provided at an angular interval of 180° around the axis.

[0032] 2 and 3, the rotating disc 44 has a circular outline when viewed in the Z-axis direction. As shown in Fig. 4, the second outer diameter dimension D2 of the rotating disc 44 is smaller than the first outer diameter dimension D1 of the fixed disc 42. The rotating disc 44 includes a disc main body 52 and a disc washer 53 stacked on the disc main body 52 in the Z2 direction. The disc main body 52 and the disc washer 53 have the same outer diameter dimension.

[0033] The disk body 52 is the part of the rotating disk 44 that comes into contact with the fixed disk 42. The disk body 52 is made of ceramics. The disk body 52 includes a rotating disk side sealing portion 54 that comes into sliding contact with the fixed disk side sealing portion 49, and a pair of communication holes 55 provided at a part of the circumferential direction of the rotating disk side sealing portion 54. The end face of the rotating disk side sealing portion 54 in the Z1 direction is a smooth surface perpendicular to the axis L. When viewed from the Z axis direction, each communication hole 55 has a fan shape that widens toward the outer periphery. The pair of communication holes 55 are provided at an angular interval of 180° around the axis. As shown in Figures 1 and 4, each communication hole 55 overlaps with each opening 50 of the rotating disk 44 when the rotating disk 44 is arranged at a first angular position 44A around the axis. 5, each communication opening 55 overlaps with the fixed-disk-side sealing portion 49 when the disk body 52 is positioned at a second angular position 44B that is 90° apart from the first angular position 44A. As shown in FIG. 2, the end face of the disk body 52 in the Z2 direction has a plurality of engagement recesses 56 on the outer circumferential edge portion.

[0034] The disc washer 53 is made of resin. The disc washer 53 has a pair of through holes 58 provided at two locations in the circumferential direction. When viewed from the Z-axis direction, each through hole 58 has a fan shape that widens toward the outer periphery. The pair of through holes 58 is provided at an angular interval of 180° around the axis. The disc washer 53 also has a fitting hole 59 in its center. The fitting hole 59 is rectangular. The inner peripheral end portions of the two through holes 58 overlap with the longitudinal center portion of the fitting hole 59. Furthermore, as shown in FIG. 3, the disc washer 53 has a plurality of engaging protrusions 60 on the outer periphery of the end face in the Z1 direction.

[0035] The disc washer 53 is integrated with the disc body 52 by engaging the engaging protrusions 60 with the engaging recesses 56 of the disc body 52. ​​As shown in FIGS. 4 and 5, when the state in which the disc washer 53 is integrated with the disc body 52 is viewed from the Z-axis direction, the through holes 58 of the disc washer 53 overlap with the communication openings 55 of the disc body 52. ​​Here, as shown in FIGS. 2 and 3, a rectangular parallelepiped plate portion 13 is provided at the tip of the protrusion 11 of the spindle 10. The spindle 10 is connected to the rotating disc 44 by fitting the plate portion 13 into a fitting hole 59 of the disc washer 53.

[0036] 2, ridges 62 extending circumferentially around the axis are provided on both sides of the protrusion 11 (axis L) on the Z2-direction end face 53a (opposing surface) of the disc washer 53. The two ridges 62 are spaced apart in the circumferential direction. The two ridges 62 are also provided at angular positions spaced 90° apart from the pair of through holes 58 around the axis.

[0037] 1, the spindle 10, support portion 41, elastic member 43, fixed disk 42, and rotatable disk 44 are arranged coaxially. When the state in which the rotatable disk 44 is stacked on the fixed disk 42 in the Z2 direction is viewed from the Z2 direction, as shown in FIGS. 4 and 5, the fixed disk 42 has an outer peripheral region 42a located on the outer peripheral side of the rotatable disk 44. The multiple locking recesses 48 of the fixed disk 42 are located in this outer peripheral region 42a.

[0038] The separation restriction member 45 is made of resin. The separation restriction member 45 is a cylindrical member. As shown in FIG. 1, the separation restriction member 45 is disposed coaxially with the spindle 10 (protrusion 11). As shown in FIGS. 2 and 3, the separation restriction member 45 includes a cylindrical portion 65 and an annular protrusion 66 that protrudes inward from the middle of the cylindrical portion 65 in the Z-axis direction. The cylindrical portion 65 also includes a pair of openings 67 located in a portion that is positioned in the Z2 direction relative to the annular protrusion 66. The pair of openings 67 are located at angular positions spaced 180° apart from each other. The separation restriction member 45 also includes four first locking protrusions 68 (locking protrusions) that protrude in the Z1 direction from the Z1-direction end of the cylindrical portion 65, and four second locking protrusions 69 that protrude in the Z2 direction from the Z2-direction end of the cylindrical portion 65.

[0039] As shown in FIG. 1, the separation restriction member 45 is disposed between the fixed disk 42 and the cover member 32. More specifically, the Z1-direction end of the cylindrical portion 65 of the separation restriction member 45 abuts against the outer peripheral region 42a of the fixed disk 42, and the first locking projection 68 is locked in the locking recess 48 of the fixed disk 42. The Z2-direction end of the cylindrical portion 65 abuts against the annular portion 36 of the cover member 32, and the second locking projection 69 is locked in the locking groove 37 of the cover member 32. Therefore, the separation restriction member 45 is attached to the housing 8 (cover member 32) in a state where it cannot rotate around its axis. Furthermore, the fixed disk 42 is also unable to rotate around its axis because the first locking projection 68 of the separation restriction member 45 is locked in the locking recess 48. As shown in FIG. 3, the separation restriction member 45 and the locking recess Reference numeral 48 constitutes a rotation restriction mechanism 46 that prevents the fixed disk 42 from rotating around its axis.

[0040] As shown in FIG. 1 , when the separation restriction member 45 is disposed between the fixed disk 42 and the cover member 32, the annular surface of the annular protrusion 66 facing the Z1 direction serves as a sliding surface 70 that contacts the rotating disk 44 from the side opposite the fixed disk 42. The sliding surface 70 is perpendicular to the axis L. Each of the protrusions 62 of the rotating disk 44 (disk washer 53) slides against the sliding surface 70. That is, the end surface of each protrusion 62 in the Z2 direction serves as a rotating disk-side sliding surface 62a that slides against the sliding surface 70. The rotating disk-side sliding surface 62a is perpendicular to the axis L. When the separation restriction member 45 is disposed between the fixed disk 42 and the cover member 32, the pair of openings 67 provided in the cylindrical portion 65 are aligned in the X-axis direction. Furthermore, the elastic member 43 is compressed in the Z-axis direction between the fixed disk 42 and the support portion 41.

[0041] 2 and 3, the sliding surface 70 has a protrusion 71 that protrudes between two circumferentially adjacent ridges 62. The rotating disc 44 rotates within a rotation angle range in which the protrusion 71 moves relatively between the two circumferentially adjacent ridges 62. In this example, the rotation angle range in which the rotating disc 44 rotates is 90°.

[0042] (Opening and closing of stop valve) As shown in Figure 1, when stop valve 1 is installed between primary pipe 2 and secondary pipe 3, water flowing into stop valve 1 from primary pipe 2 passes through primary flow path 21a, opening 67 of separation restriction member 45, internal flow path 23a, and secondary flow path 22a in this order, and then flows into secondary pipe 3. In stop valve 1, sliding surface 70 of separation restriction member 45 with which rotating disc 44 slides, rotating disc 44, fixed disc 42, elastic member 43, and support part 41 are arranged in this order from upstream to downstream in water flow direction G.

[0043] As shown in Fig. 4, in the water-passing state, the rotating disc 44 is positioned at a first angular position 44A. When the rotating disc 44 is positioned at the first angular position 44A, a protrusion 71 provided on a sliding contact surface 70 of the separation restricting member 45 abuts against one of two protrusions 62 located on either side of the protrusion 71 on the rotating disc 44 from the circumferential direction. Furthermore, when the rotating disc 44 is positioned at the first angular position 44A, the communication port 55 of the rotating disc 44 (disc main body 52) overlaps with the opening 50 of the fixed disc 42. This opens the internal flow path 23a, so that the primary piping 2 and the secondary piping 3 communicate with each other via the stop valve 1.

[0044] To change the stop valve 1 from a water-passing state to a water-stopping state, a drive signal is input from an external device to the actuator 6. When the drive signal is input, the actuator 6 rotates the spindle 10 by 90° in the rotational direction R1 indicated by the arrow in FIG. 4 . This causes the rotating disk 44 to rotate 90° and be positioned at the second angular position 44B. When the rotating disk 44 is positioned at the second angular position 44B, the protrusion on the sliding surface 70 of the separation restricting member 45 abuts against the other of the two protrusions 62 located on both sides of the protrusion 71 from the circumferential direction. When the rotating disk 44 is positioned at the second angular position 44B, the communication opening 55 of the rotating disk 44 overlaps with the fixed-disk-side closing portion 49 of the fixed disk 42. This closes the internal flow path 23a, causing the stop valve 1 to be in a water-stopping state, and the primary-side piping 2 and the secondary-side piping 3 are blocked from each other.

[0045] Thereafter, when a drive signal is input to the actuator 6, the actuator 6 rotates the spindle 10 by 90° in the reverse direction (rotation direction R2). As a result, when the rotating disc 44 rotates by 90°, the stop valve 1 returns to the water-passing state.

[0046] (Action and effect) The stop valve 1 of this example allows or stops water flow by opening and closing the internal flow path 23a using an opening / closing mechanism 24 including a fixed disk 42 and a rotating disk 44. That is, the rotating disk 44 is rotated by rotating the spindle 10, and water is allowed to flow by overlapping the opening 50 of the fixed disk 42 with the communication port 55 of the rotating disk 44, and water is stopped by overlapping the fixed disk-side closing portion 49 of the fixed disk 42 with the communication port 55 of the rotating disk 44.

[0047] According to this example, the stop valve 1 is provided with a separation restriction member 45 that is fixed to the housing 8 and contacts the rotating disc 44 from the side opposite the fixed disc 42, preventing the rotating disc 44 from separating from the fixed disc 42. This restricts the rotating disc 44 and the fixed disc 42 from separating in the Z-axis direction, preventing water from leaking between the rotating disc 44 and the fixed disc 42. The stop valve 1 also includes an annular elastic member 43 that is interposed between the fixed disc 42 and the support portion 41 while being compressed in the Z-axis direction. This allows the annular elastic member 43 to function as a packing and prevent water from leaking between the fixed disc 42 and the support portion 41 of the housing 8.

[0048] When the rotating disc 44 is rotated to allow or stop water flow, the rotating disc 44 is subjected to the following forces: water pressure (water pressure) exerted on the rotating disc 44 (rotating disc-side sealing portion 54) by water flowing into the stop valve 1; frictional forces between the rotating disc 44 and the fixed disc 42; and frictional forces between the rotating disc 44 and the sliding surface 70 of the separation restricting member 45. In this example, the fixed disc 42 and the portion of the rotating disc 44 that comes into contact with the fixed disc 42 (disc body 52) are made of ceramic and have high hardness. Therefore, friction when the rotating disc 44 slides against the fixed disc 42 can be reduced compared to when a metal valve body, such as a ball valve body, slides between two plastic or rubber valve seats. Therefore, this example allows the stop valve 1 to be opened and closed with less force than when opening and closing a ball stop valve.

[0049] In this example, the sliding surface 70 of the separation restriction member 45, against which the rotating disc 44 slides, the rotating disc 44, the fixed disc 42, the elastic member 43, and the support portion 41 are arranged in this order from upstream to downstream in the water flow direction G. Therefore, the pressure exerted by water flowing into the stop valve 1 on the rotating disc-side sealing portion 54 of the rotating disc 44 presses the rotating disc 44 and the fixed disc 42 against the support portion 41 via the elastic member 43. That is, the pressure of the water flowing into the stop valve 1 acts in a direction that compresses the elastic member 43 interposed between the fixed disc 42 and the support portion 41 in the Z-axis direction. This reduces the elastic restoring force of the elastic member 43 compressed in the Z-axis direction and presses the rotating disc 44 against the sliding surface 70 via the fixed disc 42. Therefore, the frictional force between the rotating disc 44 and the sliding surface 70 of the separation restriction member 45 is reduced compared to when no water pressure is applied. Therefore, according to the stop valve 1 of this embodiment, the internal flow path 23a can be opened and closed with a smaller force.

[0050] In this example, the sliding surface 70 is provided in an annular shape centered on the axis L. The rotating disc 44 has ridges 62 extending circumferentially around the axis on both sides of the protrusion 11 on an opposing surface (the end surface 53a of the disc washer 53 in the Z2 direction) that faces the sliding surface 70. The end surface of each ridge 62 in the Z axis direction is a rotating disc-side sliding surface 62a that comes into sliding contact with the sliding surface 70. With this configuration, the area of ​​contact between the rotating disc-side sliding surface 62a of the rotating disc 44 and the sliding surface 70 of the separation restriction member 45 can be reduced. This makes it easy to reduce the frictional force between the rotating disc 44 and the sliding surface 70 of the separation restriction member 45.

[0051] In this example, the two protrusions 62 of the rotating disk 44 are spaced apart in the circumferential direction. The sliding surface 70 of the separation restriction member 45 has a protrusion 71 that protrudes between two protrusions 62 that are adjacent in the circumferential direction. The rotating disk 44 rotates within a rotation angle range in which the protrusion 71 moves relatively between the two protrusions 62 that are adjacent in the circumferential direction. Therefore, the protrusion 71 provided on the sliding surface 70 of the separation restriction member 45 In the rotating disc 44, the two ridges 62 sandwiching the protrusion 71 in the circumferential direction can define the rotation angle range within which the rotating disc 44 rotates around the axis.

[0052] In this example, the opening / closing mechanism 24 is equipped with a rotation restriction mechanism 46 that prevents the fixed disk 42 from rotating around its axis. Here, the fixed disk 42 is supported on the support part 41 via an elastic member 43. Furthermore, the pressure of water flowing into the stop valve 1 acts in a direction that presses the fixed disk 42 against the support part 41. Therefore, when the rotating disk 44 rotates, the fixed disk 42 is prevented or suppressed from rotating together with the rotating disk 44. However, if the opening / closing mechanism 24 is equipped with the rotation restriction mechanism 46, the fixed disk 42 can be reliably prevented from rotating together with the rotating disk 44.

[0053] In this example, the fixed disk 42 and the rotatable disk 44 have circular contours. The fixed disk 42 and the rotatable disk 44 are arranged coaxially. The first outer diameter dimension D1 of the fixed disk 42 is larger than the second outer diameter dimension D2 of the rotatable disk 44, and the fixed disk 42 has a locking recess 48 recessed in the Z1 direction in an outer peripheral region 42a located on the outer peripheral side of the rotatable disk 44 when viewed in the Z-axis direction. The separation restriction member 45 has a first locking protrusion 68 that protrudes in the Z-axis direction from the outer peripheral side of the sliding surface 70 and is locked in the locking recess 48. The separation restriction member 45 and the locking recess 48 constitute a rotation restriction mechanism 46. That is, in this example, the rotation restriction mechanism 46 can be provided using the separation restriction member 45.

[0054] In this example, an electric actuator 6 is provided which is fixed to a housing 8 and connected to an exposed portion 9, and the actuator 6 rotates a spindle 10. Therefore, the stop valve 1 can be opened and closed by driving the actuator 6.

[0055] Here, the stop valve 1 of this example can be opened and closed with a relatively small force. Therefore, according to this example, the stop valve 1 can be opened and closed even if the torque with which the actuator 6 rotates the spindle 10 is small. Therefore, the actuator 6 can employ a drive unit 16 with a small torque. In addition, the drive unit 16 can be provided with a battery as the power source.

[0056] (Variation) The separation restriction member 45 is attached to the communicating portion 23 in a state where it cannot rotate about its axis, and is provided with a sliding surface 70 that comes into contact with the rotating disk 44 from the side opposite to the fixed disk 42. Therefore, the separation restriction member 45 may be fixed to the inner circumferential surface of the communicating portion 23 in the main body member 31. Furthermore, the separation restriction member 45 does not have to come into contact with the fixed disk 42.

[0057] Furthermore, rotation restricting mechanism 46 may be configured between housing 8 and fixed disk 42. For example, rotation restricting mechanism 46 may include a vertical groove provided on the outer peripheral surface of fixed disk 42, and a locking protrusion that protrudes from communicating portion 23 toward internal flow path 23a and is locked in the vertical groove. Note that rotation restricting mechanism 46 may also be omitted.

[0058] Furthermore, in the above example, the primary side pipe section 21 and the extended pipe section 26 of the secondary side pipe section 22 are coaxial, but the primary side pipe section 21 and the extended pipe section 26 may extend in different directions around the axis.

[0059] The actuator 6 may also be omitted. In this case, a handle for operating the spindle 10 can be attached to the exposed portion 9 of the spindle 10. In this example, the rotating disc 44 can be opened and closed with a relatively small force. Therefore, it is easy to open and close the stop valve by manually rotating the spindle 10.

[0060] In this example, the two ridges 62 of the rotating disc 44 are spaced apart in the circumferential direction. The sliding surface 70 of the control member 45 has a protrusion 71 that protrudes between two circumferentially adjacent ridges 62. The rotating disc 44 rotates within a rotation angle range in which the protrusion 71 moves relatively between two circumferentially adjacent ridges 62. Therefore, when manually operating the spindle 10, the operator can know the rotation range of the spindle 10. Therefore, it is easy to place the rotating disc 44 in the first angular position 44A to put the stop valve 1 in a water-passing state. It is also easy to place the rotating disc 44 in the second angular position 44B to put the stop valve 1 in a water-stopping state. [Explanation of symbols]

[0061] 1...Stop valve, 2...Primary side piping, 3...Secondary side piping, 5...Stop valve body, 6...Actuator, 8...Housing, 9...Exposed portion, 10...Spindle, 11...Protruding portion, 13...Plate portion, 15...Battery, 16...Drive unit, 17...Communication unit, 21...Primary side pipe portion, 21a...Primary side flow path, 22...Secondary side pipe portion, 22a...Secondary side flow path, 23...Communication portion, 23a...Internal flow path, 24...Opening / closing mechanism, 25...Bent pipe portion, 26...Extension pipe portion, 30...Opening, 31...Main body member, 32...Cover member, 33...Gasket, 34...Bolt, 35...Support portion, 36...Annular portion, 37...Engaging groove, 41...Support portion, 42...Fixed disk, 42a...Outer periphery region, 43...Elastic member , 44...rotating disc, 44A...first angular position, 44B...second angular position, 45...separation restriction member, 46...rotation restriction mechanism, 47...annular groove, 48...engaging recess, 49...fixed disc side sealing portion, 50...opening, 52...disc body, 53...disc washer, 53a...end face (opposing surface) of disc washer, 54...rotating disc side sealing portion, 55...communication port, 56...engaging recess, 58...through hole, 59...fitting hole, 60...engaging protrusion, 62...protrusion, 62a...rotating disc side sliding surface, 65...cylindrical portion, 66...annular protrusion, 67...opening, 68...first locking protrusion, 69...second locking protrusion, 70...sliding surface, 71...protrusion, R1...rotation direction

Claims

1. a housing having a primary-side pipe portion having a primary-side flow path, a secondary-side pipe portion having a secondary-side flow path, and a communication portion having an internal flow path that communicates the primary-side flow path with the secondary-side flow path; a spindle rotatably supported by the housing and having a protruding portion that protrudes into the internal flow path on one side in the axial direction and an exposed portion that is exposed to the outside of the housing on the other side; and an opening / closing mechanism that opens and closes the internal flow path, the opening and closing mechanism comprises: an annular support portion provided in the communication portion and surrounding the internal flow path; a fixed disk whose outer periphery is supported by the support portion; a rotating disk connected to the protrusion portion and rotating integrally with the spindle and coming into surface contact with the fixed disk from the side opposite the support portion; an annular elastic member interposed between the fixed disk and the support portion in a state compressed in the axial direction; and a separation prevention member attached to the housing in a state unrotatable about the axis and preventing the rotating disk from separating from the fixed disk in the axial direction, the separation restriction member has a sliding surface that contacts the rotating disk from the side opposite to the fixed disk, the fixed disk is made of ceramic and includes a fixed disk-side sealing portion that seals the internal flow path, and an opening provided at a portion of the fixed disk-side sealing portion in a circumferential direction, the rotating disk includes a rotating disk side sealing portion that contacts the fixed disk side sealing portion, and a communication opening that is provided at a portion of the rotating disk side sealing portion in the circumferential direction, the communication opening overlapping with the opening when the rotating disk is disposed at a first angular position around the axis of the spindle, and overlapping with the fixed disk side sealing portion when the rotating disk is disposed at a second angular position different from the first angular position, the portion that contacts the fixed disk being made of ceramic, A stop valve characterized in that the sliding surface, the rotating disk, the fixed disk, the elastic member, and the support part are arranged in this order from upstream to downstream in the flow direction of water flowing from the primary side flow path through the internal flow path to the secondary side flow path.

2. the sliding contact surface is provided in an annular shape centered on the axis, the rotating disk has a surface facing the sliding contact surface, on both sides of the protrusion, the protrusions extending in the circumferential direction around the axis, 2. The stop valve according to claim 1, wherein the axial end face of each protrusion is a rotating disc-side sliding surface that slides against the sliding surface.

3. The plurality of protrusions are spaced apart in the circumferential direction, the sliding contact surface includes a protrusion protruding between two of the protrusions adjacent to each other in the circumferential direction, The stop valve according to claim 2, wherein the rotating disc rotates within a rotation angle range in which the protrusion moves relatively between two of the ridges adjacent in the circumferential direction.

4. The stop valve according to claim 1, wherein the opening / closing mechanism includes a rotation restriction mechanism that prevents the fixed disk from rotating around the axis.

5. the fixed disc and the rotating disc have a circular contour; The fixed disk and the rotating disk are arranged coaxially, a first outer diameter dimension of the fixed disc being larger than a second outer diameter dimension of the rotating disc; the fixed disk has a locking recess recessed in the axial direction in an outer peripheral region located on the outer peripheral side of the rotating disk when viewed from the axial direction, the separation restriction member includes a locking projection that projects in the axial direction from an outer circumferential side of the sliding contact surface and is locked in the locking recess, The stop valve according to claim 4, wherein the rotation restriction mechanism includes the separation restriction member and the locking projection.

6. an electric actuator fixed to the housing and connected to the exposed portion; The stop valve according to claim 1 , wherein the actuator rotates the spindle.

7. The stop valve according to claim 6, wherein the actuator includes a battery as a power source.

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