JP5353001B2 - Water tap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drain plug which can prevent a user from stopping the operation of an operation axis in progress at the time of switching operation from a drain state to a normal state since the movement distance of the operation axis in the axial direction at the time of switching operation between the normal state and the drain state is relatively small, and an operation force does not fluctuate. <P>SOLUTION: The drain plug 10 is provided with the operation axis 20, a drain clearance S, two seal rings 22a, 22b, and a peripheral channel 19b. The operation axis 20 is inserted to the interior of a drain hole 19f connecting between a water-connection passage 17a and the outside so that it can move in the axis X direction, and the drain clearance S is provided between the inner peripheral surface 19a of the drain hole 19f and the outer peripheral surface 20e of the operation axis 20. The two seal rings 22a, 22b are provided and engaged with the outer peripheral surface 20e in order to seal the drain clearance S, and the peripheral channel 19b is provided on the inner peripheral surface 19a. By moving the operation axis 20 in the axis X direction, switching can take place between a normal state and a drain state. In the normal state, the peripheral channel 19b is positioned between the seal rings 22a, 22b, and in the drain state, the seal ring 22b is placed opposed to the peripheral channel 19b and comes off the inner peripheral surface 19a of the drain hole 19f. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a drain plug for drain operation provided to prevent the faucet from being damaged by freezing.

  When there is a possibility that a faucet installed in a cold district may freeze, measures are taken to prevent breakage by opening the water faucet provided in the faucet and draining water. For such a drain plug, various mechanisms have been developed and implemented in the past. However, as related to the present invention, a flat seal is pressed against the faucet body by loosening the operation shaft. There is a type in which the packing is separated from the faucet body to drain water, or a type in which water is drained by removing an O-ring for sealing attached to the operation shaft of the faucet (for example, Patent Document 1). reference.).

JP 2004-278243 A

  In the flat packing described in Patent Document 1, the sealing performance is affected by the tightening force of the user. Therefore, if the tightening force is weak, water may leak, and conversely, if the tightening force is too strong, There is a risk that it will be too hard to move.

  On the other hand, in the case of a method using an O-ring, the operating force is constant and the sealing performance is stable, but the O-ring seal portion is inserted and removed each time, so the O-ring bites and water leaks. there is a possibility. In this case, if the O-ring is doubled, it is possible to improve the reliability against water leakage, but the movement distance of the water draining shaft portion for inserting / removing the O-ring becomes long. Further, when removing the O-ring in order, the operation force of the water drainer changes stepwise, so that the operability is lowered. Further, since water leakage does not occur if sealed by one O-ring, it is also predicted that the user stops tightening the water drain plug on the way.

  The problem to be solved by the present invention is that the movement distance in the axial direction of the operation shaft during the switching operation between the normal state and the drainage state is relatively small and the operation force does not fluctuate. An object of the present invention is to provide a water drain plug that does not cause the user to stop the operation of the operation shaft during operation.

The drain plug of the present invention includes an operation shaft that is inserted in a water drain hole communicating with a water passage and the outside along the axial direction, an inner peripheral surface of the water drain hole, and an outer periphery of the operation shaft. A drain gap provided along the axial direction between the surface and one of the inner peripheral surface of the drain hole and the outer peripheral surface of the operation shaft to seal the drain gap. Narrower than the distance between the seal rings provided on the inner peripheral surface of the drain hole or the outer peripheral surface of the operation shaft on which the seal ring is not mounted, And a circumferential groove,
By moving the operation shaft in the axial direction,
A normal state in which the circumferential groove is located between the seal rings;
One of the seal rings is opposed to the circumferential groove, and the other seal ring can be switched to a drained state where the seal ring is detached from the inner peripheral surface of the drain hole or the outer peripheral surface of the operation shaft. .

  With such a configuration, by moving the operating shaft in the axial direction, the circumferential groove is positioned between the two seal rings, so that the two seal rings simultaneously seal the drainage gap, The seal ring can be switched to a drained state in which the other seal ring is opposed to the circumferential groove and the other seal ring is detached from the inner peripheral surface of the drain hole or the outer peripheral surface of the operation shaft. For this reason, the movement distance in the axial direction of the operation shaft at the time of switching operation between the normal state and the drainage state can be made relatively small as in the case of the single seal, the operation force is stabilized, and the user is misidentified. There is no need to stop the operation of the operation axis.

An operation shaft that is movably inserted along the axial direction in a drain hole that communicates the water passage with the outside, and the shaft between the inner peripheral surface of the drain hole and the outer peripheral surface of the operation shaft. In order to seal the drainage gap provided along the center direction and the drainage gap, the drainage hole is fitted to one of the inner peripheral surface of the drainage hole and the outer peripheral surface of the operation shaft in a state separated from each other in the axial direction. Two seal rings, and taper portions or step portions formed respectively on the inner peripheral surface of the drain hole between the seal rings and the outer peripheral surface of the operation shaft,
By moving the operation shaft in the axial direction,
A normal state in which the tapered portion or the stepped portion is located between the seal rings;
One of the seal rings faces the tapered portion or the stepped portion, and the other seal ring can be switched to a drained state in which the drain hole is detached from the inner peripheral surface of the drain hole or the outer peripheral surface of the operation shaft. And

  With such a configuration, by moving the operating shaft in the axial direction, a tapered portion or a stepped portion is located between the two seal rings, and the two seal rings simultaneously seal the drain gap. In addition, it is possible to switch to a drained state in which one seal ring faces the tapered portion or the stepped portion and the other seal ring is detached from the inner peripheral surface of the drain hole or the outer peripheral surface of the operation shaft. For this reason, the movement distance in the axial direction of the operation shaft at the time of switching operation between the normal state and the drainage state can be made relatively small as in the case of the single seal, the operation force is stabilized, and the user is misidentified. There is no need to stop the operation of the operation axis.

  Here, the cylindrical body containing the check valve is movably disposed in the water passage along with the operation shaft, and in the normal state, the outer circumference of the cylindrical body and the inner circumference of the water passage are sealed, In the drained state, at least a part of the seal is released, and a backflow path can be formed between the outer periphery of the cylinder and the inner periphery of the water passage.

  With this configuration, the water drain plug and the check valve are integrated so that the water drain plug can be made compact, and the function of the check valve is released / returned when the water drain plug is opened / closed. Can be opened and closed easily.

  In addition, an external thread portion having a central axis about the axial center of the drain hole is formed on the outer peripheral member constituting the drain hole, and an operation portion having a female thread portion screwed with the male thread portion is provided as the female thread portion. Can be attached to the operating shaft in a state of being screwed to the male threaded portion, and the operating shaft can be moved in the axial direction by a rotating operation of the operating portion.

  With such a configuration, since the outer peripheral member constituting the drain hole can be used as a moving means in the axial direction of the operation shaft, the operation shaft can be made compact in the axial direction.

  According to the present invention, the movement distance in the axial direction of the operation shaft at the time of switching operation between the normal state and the drained state is relatively small and the operation force does not fluctuate, so that the user can operate the switch operation from the drained state to the normal state. It is possible to provide a water drain plug that does not have a risk of stopping the operation of the shaft halfway.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partially omitted front view showing a mixing faucet incorporating a water faucet and a hot water supply path according to a first embodiment of the present invention, and FIG. 2 is an enlarged view of the vicinity of a check valve housing shown in FIG. 3 is a vertical cross-sectional view showing a normal state of the water drain plug incorporated in the check valve housing shown in FIG. 2, and FIG. 4 is a vertical cross-sectional view showing a water drain state of the water drain plug shown in FIG.

  As shown in FIG. 1, a check valve housing 17 is disposed in each of a hot water supply pipe 12 and a water supply pipe 13 that are piped for supplying hot water to a hot and cold mixing tap 11 installed on the mounting surface 14. As shown in FIGS. 2 and 3, the check valve housing 17 is a bottomed cylindrical member having an opening 17e, and a water inlet 15 and a water outlet 16 are opened in the peripheral wall portion and provided inside. A cylindrical body 24 storing the check valve 27 is stored in the water passage 17a. The lid 19 attached to the opening 17e of the check valve housing 17 is provided with the water drain plug 10 and its operation section 18 and the like.

  When the operation lever 11a provided on the right side of the hot and cold water mixing tap 11 is tilted to the left and right, water is discharged and stopped from the discharge port 11b, and is discharged from the discharge port 11b by tilting the operation lever 11a back and forth. Adjust the temperature of hot water. Moreover, water discharge and water stop can also be performed by pressing the touch switch 11c above the discharge port 11b.

  As shown in FIG. 3, a water drain hole 19f that communicates the water passage 17a in the check valve housing 17 with the outside is provided coaxially with the axis X of the lid body 19, and the shaft center in the water drain hole 19f. The operation shaft 20 is inserted so as to be movable along the X direction, and a water drain gap S is provided between the inner peripheral surface 19a of the water drain hole 19f and the outer peripheral surface 20e of the operation shaft 20. In order to seal this drain gap S, two seal rings 22a and 22b are fitted to the outer peripheral surface 20e of the operating shaft 20 in the state of being separated from each other in the axial center X direction, and the seal ring is attached to the inner peripheral surface 19a of the drain hole 19f. A circumferential groove 19b narrower than the distance between 22a and 22b is provided. The two seal rings 22a and 22b are fitted in circumferential grooves 20c and 20d provided on the outer peripheral surface 20e of the operation shaft 20, respectively.

  By screwing a male screw portion 19e provided on the outer periphery of one end of the lid body 19 into a female screw portion 17d provided on the inner periphery of the opening portion 17e of the check valve housing 17, the lid body 19 is attached to the check valve housing. It is attached to the opening 17 e of the body 17. A seal ring 23 is disposed between the inner periphery of the opening 17 e of the check valve housing 17 and the outer periphery of the lid body 19. Further, a cylindrical body 24 containing a check valve 27 is attached to a diameter-enlarged end portion 20 a of the operation shaft 20 protruding from one end of the lid body 19 by a retaining ring 26. A seal ring 25 is disposed in a circumferential groove 24 a provided on the outer periphery of the cylindrical body 24.

  On the other hand, in a state where the male screw portion 19c provided on the inner periphery of the cap-shaped operation portion 18 is screwed to the male screw portion 19c provided on the outer periphery of the other end of the lid body 19, the operation portion 18 is the lid body. 19 is attached to the other end. At this time, the operating portion 18 is attached in a state where the reduced diameter portion 20b of the operating shaft 20 protruding from the other end of the lid body 19 penetrates the locking hole 18c of the operating portion 18, and protrudes outward from the locking hole 18c. The operating portion 18 is fixed to the reduced diameter portion 20b of the operating shaft 20 by attaching the retaining ring 21 to the reduced diameter portion 20b. A plurality of through holes 18 a are formed around the locking hole 18 c of the operation unit 18.

  In the normal state shown in FIG. 3, since the peripheral groove 19b of the drain hole 19f is located between the two seal rings 22a and 22b fitted on the outer peripheral surface 20e of the operation shaft 20, these seal rings 22a. , 22b seals two locations of the drainage gap S. At this time, the seal ring 25 in the circumferential groove 24a of the cylindrical body 24 that houses the check valve 27 is in close contact with the inner circumferential surface of the reduced diameter portion 17b of the water passage 17a. Accordingly, water that has flowed into the water passage 17a from the water inlet 15 in response to the operation of the operation lever 11a of the hot-water mixing tap 11 shown in FIG. 1 can flow out of the water outlet 16 through the check valve 27. The reverse flow to the water inlet 15 and the outflow from the drainage gap S to the outside are impossible.

  Next, when the operation portion 18 is rotated counterclockwise about the axis X, the operation portion 18 causes the operation shaft 20 to move the operation shaft 20 to the drain hole 19f of the lid body 19 by screwing between the female screw portion 18b and the male screw portion 19c. Move in the direction of pulling out. By such a rotation operation, the operation shaft 20 moves to the outside (left side of the drawing in FIG. 3) along the axis X, and eventually enters the drained state shown in FIG.

  In the drained state shown in FIG. 4, one seal ring 22b faces the circumferential groove 19b, and the other seal ring 22a moves out of the enlarged opening 19d of the drain hole 19f and comes off the inner peripheral surface 19a. The seal is released. At this time, the cylindrical body 24 housing the check valve 27 also moves outward (on the left side of the drawing in FIG. 4) along the axis X, so that the seal ring 25 extends from the inner peripheral surface of the reduced diameter portion 17b of the water passage 17a. It disengages and moves to the enlarged diameter portion 17c.

  When the water draining state shown in FIG. 4 is reached, the water passage 17a is in communication with the outside via the water drainage gap S, and therefore the water passage 17a, the water supply pipe 13 and the hot and cold water mixing plug 11 (FIG. 1) located above the water passage 17a. The water existing inside the reference valve casing 17 flows out of the enlarged diameter opening 19d through the gap between the cylindrical body 24 and the inner peripheral surface of the check valve housing 17 and the drainage gap S, and flows out of the operation section 18. It passes through the through hole 18a and is discharged.

  When all the water inside the water passage 17a, the water supply pipe 13 and the hot and cold water mixing tap 11 has been drained and the "drainage" has been completed, when the operation part 18 is rotated clockwise around the axis X, the female thread part 18b and male By the screwing with the screw portion 19c, the operation portion 18 moves the operation shaft 20 in a direction to be inserted into the drain hole 19f of the lid body 19, and eventually returns to the normal state shown in FIG.

  As described above, the water drain plug 10 rotates the operation portion 18 and moves the operation shaft 20 forward and backward in the direction of the axis X, thereby causing the normal state in which the circumferential groove 19b is located between the two seal rings 22a and 22b. The seal ring 22b is opposed to the circumferential groove 19b, and the other seal ring 22a can be switched to a drained state where the seal ring 22b is detached from the inner peripheral surface 19a of the drain hole 19f. Therefore, the movement distance in the axis X direction of the operation shaft 20 during the switching operation between the normal state and the drainage state can be made relatively small as in the case of the single seal. Further, since the force required for the rotation operation of the operation unit 18 is substantially constant and stable, the rotation operation of the operation unit 18 is not stopped halfway due to a user's misidentification.

  Further, in the present embodiment, the cylinder body 24 containing the check valve 27 is disposed so as to be movable along with the operation shaft 20 in the water passage 17a, and in a normal state, the outer periphery of the cylinder body 24 and the water passage path 17a are contracted. The inner periphery of the diameter portion 17b is sealed by the seal ring 25. In the drained state, the seal ring 25 is detached from the inner periphery of the reduced diameter portion 17b and the seal is released, and the outer periphery of the cylindrical body 24 and the inner periphery of the water passage 17a A backflow path is formed between the two. Therefore, the water drain plug 10 and the check valve 27 are integrated, and the water drain plug 10 can be made compact. Further, since the function of the check valve 27 can be released / returned along with the opening / closing operation of the drain plug 10, the opening / closing operation is facilitated.

  On the other hand, a male threaded portion 19c having a central axis X of the axial center X of the drainage hole 19f is formed in the lid body 19 which is an outer peripheral member constituting the drainage hole 19f, and a female threaded portion 18b screwed with the male threaded portion 19c is formed. The operation portion 18 having the female screw portion 18b is attached to the operation shaft 20 with the female screw portion 18b screwed to the male screw portion 19c. Thereby, since the cover body 19 which comprises the drain hole 19f can be utilized as a movement means of the axial center X direction of the operating shaft 20, compactization of the axial center X direction can be achieved.

  In the drain plug 10 of the present embodiment, the two seal rings 22a and 22b are fitted on the outer peripheral surface 20e of the operation shaft 20, and the peripheral groove 19b is provided on the inner peripheral surface 19a of the water drain hole 19f. Since it is not limited to this, it is possible to adopt a configuration in which two seal rings are fitted to the inner peripheral surface of the drain hole and a peripheral groove is provided on the outer peripheral surface of the operation shaft. The effect of this can be obtained.

  Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a vertical cross-sectional view showing a normal state of a water drain plug according to a second embodiment of the present invention, and FIG. 6 is a vertical cross-sectional view showing a water drain state of the water drain plug shown in FIG. 5 and 6, parts having the same structure and function as those of the constituent parts such as the water stopper 10 described above are denoted by the same reference numerals as those in FIGS. 1 to 4 and description thereof is omitted.

  As shown in FIG. 5, a water drain hole 39f that communicates the water flow path 17a in the check valve housing 17 with the outside is provided coaxially with the axis X of the lid 39, and the shaft center in the water drain hole 39f. An operation shaft 40 is inserted so as to be movable along the X direction. On the inner periphery of the drain hole 39f, a large diameter portion 39a having a large inner diameter, a small diameter portion 39b having a smaller inner diameter, a female taper portion 39g formed between the large diameter portion 39a and the small diameter portion 39b, An enlarged diameter opening 39d is provided.

  On the outer periphery of the operation shaft 40, a large diameter portion 40e having a large outer diameter, a small diameter portion 40f having a smaller outer diameter, and a male tapered portion formed between the large diameter portion 40e and the small diameter portion 40f. 40 g are provided. Further, a circumferential groove 40c is provided in the vicinity of the center in the axis X direction of the outer periphery of the large diameter portion 40e in the operation shaft 40, and a circumferential groove 40d is provided in the vicinity of the male tapered portion 40g on the outer periphery of the small diameter portion 40f. In the circumferential grooves 40c and 40d, seal rings 32a and 32b having sizes suitable for the respective outer diameters are fitted.

  The inner peripheral surfaces of the large diameter portion 39a, the female taper portion 39g and the small diameter portion 39b of the drain hole 39f, and the outer peripheral surfaces of the large diameter portion 40e, the male taper portion 40g and the small diameter portion 40f of the operation shaft 40, respectively. A drainage gap S is provided between the two. The seal rings 32a and 32b fitted into the circumferential grooves 40c and 40d are members for sealing the drainage gap S.

  The lid 39 is screwed into the female threaded portion 17d on the inner periphery of the opening 17e of the check valve housing 17 by screwing the male threaded portion 39e on the outer periphery of the lid 39 into the opening 17e of the check valve housing 17. Is attached. A seal ring 23 is disposed between the inner periphery of the opening 17 e of the check valve housing 17 and the outer periphery of the lid 39. Further, a cylindrical body 24 containing a check valve 27 is attached by a retaining ring 36 to a connecting member 41 screwed to a reduced diameter end portion 40 a of the operation shaft 40 protruding from one end of the lid 39. A seal ring 25 is disposed in a circumferential groove 24 a on the outer periphery of the cylindrical body 24.

  The operating portion 38 is attached to the other end of the lid 39 in a state where the female screw portion 38b on the inner periphery of the cap-shaped operating portion 38 is screwed into the male screw portion 39c on the outer periphery of the other end of the lid 39. . At this time, the operation portion 38 is attached in a state where the reduced diameter portion 40b of the operation shaft 40 protruding from the other end of the lid body 39 penetrates the locking hole 38c of the operation portion 38, and protrudes outward from the locking hole 38c. The operating portion 38 is fixed to the reduced diameter portion 40b of the operating shaft 40 by attaching the retaining ring 31 to the reduced diameter portion 40b. A plurality of through holes 38 a are formed around the locking hole 38 c of the operation portion 38.

  In the normal state shown in FIG. 5, the male taper portion 40g and the female taper portion 39g are located between the two seal rings 32a and 32b fitted on the outer peripheral surface of the operation shaft 40. Two portions of the drainage gap S are sealed by the seal rings 32a and 32b. At this time, the seal ring 25 in the circumferential groove 24a of the cylindrical body 24 that houses the check valve 27 is in close contact with the inner circumferential surface of the reduced diameter portion 17b of the water passage 17a. The water that has flowed into the water passage 17a from the water inlet 15 can pass through the check valve 27 and flow out from the water outlet 16. However, the reverse flow to the water inlet 15 and the outflow from the drainage gap S are impossible.

  Next, when the operation portion 38 is rotated counterclockwise about the axis X, the operation portion 38 causes the operation shaft 40 to move the operation shaft 40 to the drain hole 39f of the lid 39 by screwing between the female screw portion 38b and the male screw portion 39c. Move in the direction of pulling out. Along with this, the operation shaft 40 moves to the outside (left side in FIG. 5) along the axis X, and eventually enters the drained state shown in FIG.

  In the drained state shown in FIG. 6, one seal ring 32b faces the female taper portion 39g and the large diameter portion 39a to create a space G, and the other seal ring 32a has an enlarged opening of the drain hole 39f. It moves outside from the portion 39d and comes off the inner peripheral surface of the large diameter portion 39a, and the seal is released. At this time, the cylindrical body 24 housing the check valve 27 also moves outward (on the left side in FIG. 6) along the axis X, so that the seal ring 25 extends from the inner peripheral surface of the reduced diameter portion 17b of the water passage 17a. It disengages and moves to the enlarged diameter portion 17c.

  When the water draining state shown in FIG. 6 is reached, the water passage 17a communicates with the outside through the water draining gap S and the space G. Therefore, the water passage 17a and the water supply pipe and hot water mixing plug piped thereabove are connected. The water present inside passes through the gap between the cylindrical body 24 and the inner peripheral surface of the check valve housing 17 and the drainage gap S and flows out from the enlarged diameter opening 39d, and passes through the through hole 38a of the operation section 38. It is discharged after passing through.

  When all the water inside the water passage 17a and the like is drained and the "drainage" is completed, when the operation portion 38 is rotated clockwise around the axis X, the screwing of the female screw portion 38b and the male screw portion 39c The operation unit 38 moves the operation shaft 40 in the direction of insertion into the drain hole 39f of the lid 39, and eventually returns to the normal state shown in FIG.

  As described above, the drain plug 30 rotates the operation portion 38 and moves the operation shaft 40 in the axial center X direction, so that the female taper portion 39g and the male taper portion 40g are located between the seal rings 32a and 32b. It is possible to switch between a normal state in which the seal ring 32b is positioned and a drainage state in which one seal ring 32b faces the female taper portion 39g and the other seal ring 32a is disengaged from the inner peripheral surface of the enlarged diameter opening portion 39d of the drain hole 39f.

  Therefore, the movement distance in the axis X direction of the operation shaft 40 during the switching operation between the normal state and the drainage state can be made relatively small as in the case of the single seal. Further, since the force required for the rotation operation of the operation unit 38 is substantially constant and stable, the rotation operation of the operation unit 38 is not stopped halfway due to a user's misconception. Other functions and effects are the same as those of the water tap 10 described above.

  In the water drain plug 30 of the present embodiment, in a normal state, a female taper portion 39g and a male taper taper are formed on the inner peripheral surface of the water drain hole 39f located between the seal rings 32a and 32b and the outer peripheral surface of the operation shaft 40, respectively. Although the portion 40g is provided, but not limited to this, it is possible to adopt a configuration in which step portions are provided at substantially the same positions as the tapered portion, thereby obtaining the same effects as described above. be able to.

  The water drain plug of the present invention can be widely used as an instrument for preventing freezing damage of the water tap in a cold region.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially omitted front view showing a mixing faucet and a hot water supply path in which a water faucet according to a first embodiment of the present invention is incorporated. FIG. 2 is an enlarged view of the vicinity of a check valve housing shown in FIG. 1. FIG. 3 is a vertical sectional view showing a normal state of a water drain plug incorporated in the check valve housing shown in FIG. 2. FIG. 4 is a vertical sectional view showing a drained state of the drain plug shown in FIG. 3. It is a vertical sectional view showing the normal state of the water tap which is the second embodiment of the present invention. FIG. 6 is a vertical sectional view showing a drained state of the drain plug shown in FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 30 Drain plug 11 Hot water mixing tap 11a Operation lever 11b Discharge port 11c Touch switch 12 Hot water supply pipe 13 Water supply pipe 14 Mounting surface 15 Water inlet 16 Water outlet 17 Check valve housing 17a Water flow path 17b, 20b, 40b Reduced diameter Portion 17c Expanded portion 17d, 18b, 38b Female thread portion 17e Opening portion 18, 38 Operation portion 18a, 38a Through hole 18c, 38c Locking hole 19, 39 Lid 19a Inner peripheral surface 19b, 20c, 20d, 24a, 40c , 40d Circumferential groove 19c, 19e, 39c, 39e Male thread 19d, 39d Expanded opening 19f, 39f Drain hole 20, 40 Operation shaft 20a Expanded end 20e Outer peripheral surface 22a, 22b, 23, 25, 32a, 32b Seal ring 24 Cylinder 21, 26, 36 Retaining ring 27 Check valve 39a Large diameter portion 39b Small diameter portion 39d Expansion Opening 39g female tapered portion 40a reduced diameter end portion 40e thick portion 40f narrowed portion 40g male tapered portion 41 connecting member G space S drainage space X axis

Claims (4)

An operation shaft that is movably inserted along the axial direction in a drain hole that communicates the water passage with the outside, and the shaft between the inner peripheral surface of the drain hole and the outer peripheral surface of the operation shaft. In order to seal the drainage gap provided along the center direction and the drainage gap, the drainage hole is fitted to one of the inner peripheral surface of the drainage hole and the outer peripheral surface of the operation shaft in a state separated from each other in the axial direction. Two seal rings, and a circumferential groove having a narrower width than the distance between the seal rings provided on the inner peripheral surface of the drain hole or the outer peripheral surface of the operation shaft on which the seal ring is not fitted. ,
By moving the operation shaft in the axial direction,
A normal state in which the circumferential groove is located between the seal rings;
One of the seal rings is opposed to the circumferential groove, and the other seal ring can be switched to a drained state where the seal ring is detached from the inner peripheral surface of the drain hole or the outer peripheral surface of the operation shaft. Water tap. An operation shaft that is movably inserted along the axial direction in a drain hole that communicates the water passage with the outside, and the shaft between the inner peripheral surface of the drain hole and the outer peripheral surface of the operation shaft. In order to seal the drainage gap provided along the center direction and the drainage gap, the drainage hole is fitted to one of the inner peripheral surface of the drainage hole and the outer peripheral surface of the operation shaft in a state separated from each other in the axial direction. Two seal rings, and taper portions or step portions formed respectively on the inner peripheral surface of the drain hole between the seal rings and the outer peripheral surface of the operation shaft,
By moving the operation shaft in the axial direction,
A normal state in which the tapered portion or the stepped portion is located between the seal rings;
One of the seal rings faces the tapered portion or the stepped portion, and the other seal ring can be switched to a drained state in which the drain hole is detached from the inner peripheral surface of the drain hole or the outer peripheral surface of the operation shaft. A water drainer. A cylinder containing a check valve is movably disposed in the water passage with the operation shaft, and in the normal state, the outer periphery of the cylinder and the inner circumference of the water passage are sealed, and the water drained state according to claim 1 or 2 drain tap according to, characterized in that the backflow passage is formed between the inner periphery of the outer peripheral and the water flow path of at least a part is released the cylindrical body of the seal. A male screw portion having a central axis about the axis of the drain hole is formed on the outer peripheral member constituting the drain hole, and an operation portion having a female screw portion screwed with the male screw portion is provided as the female screw portion. attached to the operating shaft in a state that is screwed to the male screw portion, wherein the operating shaft by the rotation operation of the operation unit according to any one of claims 1-3, characterized in that to move the axial direction Water tap.

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