JP3012395U - Antifreeze water stopper - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an antifreeze water stopper for discharging water in a pipe to prevent freezing in the pipe and improving sealing performance when the on-off valve is closed. [Structure] The on-off valve ball valve 3 has valve seats 11 and 1 on the valve body.
It is rotatably supported via 2. When the valve is open, the inflow passage 9 and the outflow passage 10 communicate with each other through the valve passage 13 of the ball valve 3. When the valve is closed, the valve passage rotates and the inflow passage 9 and the outflow passage 10 are shut off. On the other hand, the slot valve opening / closing plate 18 rotates in conjunction with the closing operation of the ball valve 3 to release the engagement with the slot valve 24. This allows the slot valve 2
4 moves upward, the opening hole 21 communicates with the discharge passage 10 side, and the water on the downstream side passes through the opening hole 21 and is discharged to the outside.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is an antifreeze water stopper that is installed in the middle part of a water pipe or the like and discharges the stored water on the downstream side to the outside to prevent freezing of the pipe due to the water that is stored on the downstream side when closed. To be involved.

[0002]

[Prior art]

 In general cold regions, freezing of water supply and sewerage systems in winter is a problem. For this reason, a water drain plug is provided in the middle of the water supply and sewer system so that the stored water on the downstream side exposed on the ground is discharged to the atmosphere side when not in use. Various types of antifreeze water stoppers have been adopted, and one known technique is disclosed in Japanese Patent Publication No. 56-19416. This "antifreeze water stopper" is provided with a ball valve between a first valve seat and a second valve seat provided on the upstream and downstream sides of its main body and supports the ball valve rotatably on the main body. An L-shaped valve passage is provided for communicating with the upstream and downstream passages when the ball valve is opened and only with the downstream side when closed, and the valve passage when the ball valve is closed is provided on the second valve seat side. It is provided with a drainage passage that communicates with.

[0003]

[Problems to be solved by the device]

 In the above-mentioned known technique, since the ball valve is provided with the L-shaped valve passage as described above, the opening portion of the valve passage is formed in a part of the seal spherical surface which is in close contact with the second valve seat of the ball valve when closed. To be done. Generally, the on-off valve sealability depends on the closeness of the seal surface, and if an opening is formed on the seal surface, it causes the sealability to deteriorate, resulting in water leakage. That is, in the conventional technology, the water is stopped only on the primary side (upstream side), and the seal is likely to be incomplete and external leakage is likely to occur. In addition, forming an opening on the spherical surface is a top-down process. In addition, most of the existing water drain plugs other than the above-mentioned publicly known technologies have a structure in which the opening and closing valve itself has an opening similar to the above.

The present invention solves the above problems, and there is no opening on the sealing surface of the on-off valve, and the primary and secondary sides can be sealed to prevent water leakage and improve the sealing performance. It is an object of the present invention to provide an antifreezing water tap that releases water on the downstream side in conjunction with the closing operation of the valve.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention opens and closes a plug body and a valve passage that is rotatably supported by the plug body via a valve seat and selectively communicates the upstream side and the downstream side. A valve, an inflow pipe and an outflow pipe having an inflow passage and an outflow passage connected to the upstream side and the downstream side of the stopper body and communicating with the valve passage, and the water on the downstream side to the outside when the on-off valve is closed. A drainage valve having a drain valve, etc. for discharging to the inside of the stopper body, wherein the drain valve is slidably supported by the stopper body so as to open and close the opening hole that opens to the downstream side of the stopper body. Slot valve, a drain pipe with a check valve formed at a position communicating with the opening hole when the slot valve is opened, and a slot valve for pressing the slot valve to a position for closing the opening hole. Abuttingly engaging with and being rotatable to the on-off valve side. A slot valve opening / closing plate connected to the slot valve and a spring for urging the slot valve in a direction to constantly press the plate toward the plate side are provided, and the slot valve opening / closing plate is provided with the slot valve when the opening / closing valve is rotated to a closed position. It constitutes an antifreeze water stopper formed so as to open the contact with.

[0006]

[Action]

 When the on-off valve is opened, the valve passage of the on-off valve communicates with the inflow passage and the outflow passage of the inflow pipe and the outflow pipe, and the water on the upstream side is supplied to the downstream side. In this case, the opening of the drain valve opens toward the outflow passage, but the slot valve is restrained from moving in the axial direction by the slot valve opening / closing plate, so that the communication between the opening and the drain valve is blocked. Therefore, the water on the downstream side does not flow into the drain valve side. On the other hand, when the opening / closing valve is closed, the slot valve opening / closing plate is separated from the slot valve accordingly, and the slot valve moves in the axial direction by the spring force of the spring. Therefore, the opening hole communicates with the drain valve side, and the water on the downstream side pushes up the check valve of the drain pipe and flows out to the outside. As a result, all the water stored on the downstream side is discharged to the outside via the drain valve, and the freezing of the stored water disappears.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 is an axial sectional view showing the overall structure of the present embodiment, FIG. 2 is a partial top view taken along the arrow A in FIG. 1, FIG. 3 is an enlarged sectional view taken along the line CC of FIG. 2, and FIG. FIG. 5 is an enlarged axial sectional view showing a detailed structure around it, FIG. 5 is an enlarged partial axial sectional view showing an opened state of the slot valve of FIG. 4, and FIG. 6 is a partial front view of FIG.

First, the overall structure of the antifreezing water stopper 1 will be described with reference to FIG. A ball valve 3, which is an on-off valve, is housed in the valve body 2, and a joint 4 to which an upstream inflow pipe is connected and a downstream outflow pipe 5 are connected to both ends of the ball valve 3. The joint 4 is screwed to the valve body 2, and the outflow pipe 5 is connected by a union nut 6. Further, the outflow pipe 5 is inserted into the valve main body 2 through a seal member 7 so that one end side of the outflow pipe 5 is closely contacted with the union nut 8 and the other end side thereof is connected. An inflow passage 9 is formed in the joint 4, and an outflow passage 10 is formed in the outflow pipe 5. The valve seat 11 on the upstream side is fitted to the joint 4, and the valve seat 12 on the downstream side is directly fitted to the valve body 2. The ball valve 3 is in close contact with the valve seats 11 and 12. The above structure is merely an example, and the inflow and outflow sides may have any shape.

The ball valve 3 is made of a spherical body, and when closed, the semispherical surface without a hole is in close contact with the valve seats 11 and 12, and blocks the communication between the upstream side and the downstream side. On the other hand, a valve passage 13 is formed through the ball valve 3 for communicating the upstream side and the downstream side when opened. One end side of a stopper rod 14 is connected to the ball valve 3. The stopper rod 14 is rotatably supported by the valve body 2, and its movement in the thrust direction is restricted by a stopper rod retainer 15 screwed to the valve body. A handle 16 is fixed to the other end of the stopper rod 14 with a screw 17 or the like. One end side of the slot valve opening / closing plate 18 is fixed to the stopper rod 14, and the movement in the axial direction is restrained by the fixing ring 19. The slot valve opening / closing plate 18 is formed in a fan shape as shown in FIG. Further, as shown in FIG. 3, the slot valve opening / closing plate 18 is formed with an inclined surface 18a having an angle θ.

Next, the structure of the drain valve 20 will be described with reference to FIGS. 1 to 4. An opening hole 21 that communicates with the outflow passage 10 side is formed on the downstream side of the valve body 2, and the opening hole 21 communicates with a slot valve sliding hole 22 having a larger diameter than that. A slot valve 24 having a reduced-diameter slot portion 23 is slidably supported in the slot valve sliding hole 22 along the axial direction. O-rings 32 and 33 are provided between the slot valve 24 and the valve sliding hole 22. On the upper end side of the slot valve 24 in the drawing, the slot valve opening plate 18 in which the inclined surface 18a is not formed abuts and engages, and restrains the upward movement of the slot valve 24. Note that the slot valve opening / closing plate 18 abuts and engages with the slot valve 24 only when the ball valve 3 is opened, as shown in FIGS. 1 and 2, and when the ball valve 3 is closed, two points shown in FIG. The abutting engagement between the two is released as shown by the chain line. Further, the slot retainer 25 is screwed around the upper end side of the slot valve 24 of the valve main body 2 and the upper portion of the slot valve 24 when the abutting engagement between the slot valve 24 and the slot valve opening / closing plate 18 is released. The ascending position is restricted. A spring 26 is interposed between the slot valve 24 and the valve body 2 to urge the slot valve 24 so as to constantly push the slot valve 24 upward. On the other hand, as shown in FIGS. 2 and 6, a drain pipe 27 is connected to the valve body 2, and a drain passage 28 thereof communicates with the slot valve sliding hole 22. The drain passage 28 is blocked from communicating with the slot valve sliding hole 22 by the slot valve 24 when the ball valve 3 is opened. A check valve 29 is provided in the drainage channel 28 to prevent inflow into the drainage channel 28 from the outside. A drain port 30 is formed through the open end of the drain pipe 27, and the periphery of the drain port 30 is protected by a protective cap 31 to prevent dust and the like from entering from the outside.

Next, the operation of this embodiment will be described. First, the relational position of each part in a normal flowing state where the upstream side and the downstream side communicate will be described. First, as shown in FIGS. 1 and 4, the ball valve 3 is rotated to direct the valve passage 13 in a direction in which the inflow passage 9 and the outflow passage 10 are communicated with each other. In this state, the fan-shaped portion on the tip end side of the slot valve opening / closing plate 18 whose base end side is fixed to the stopper rod 14 of the ball valve 3 covers the upper end of the slot valve 24 and engages with it. Therefore, the slot valve 24 closes the drainage channel 28, and the opening hole 21 does not communicate with the drainage channel 28.

Next, as shown in FIG. 5, when the ball valve 3 is rotated by about 90 °, the valve passage 13 moves in a direction in which the inflow passage 9 and the outflow passage 10 do not communicate with each other, so that from the upstream side to the downstream side. The introduction of water is blocked. As the ball valve 3 rotates, the slot valve opening / closing plate 18 rotates, and the contact engagement between the slot valve opening / closing plate 18 and the slot valve 24 is released. Therefore, the spring 26 pushes the slot valve 24 upward, and moves the slot valve 24 to a position where the upper end side of the slot valve 24 and the slot retainer 25 come into contact with each other. As a result, the opening hole 21 and the drainage channel 28 communicate with each other. Therefore, as shown in FIG. 5, the water in the outflow passage 10 is introduced from the opening hole 21 to the drain passage 28 side, pushes up the check valve 29, and is drained to the outside from the drain outlet 30. As a result, the water accumulated on the downstream side is drained to the outside and does not remain in the pipe. Therefore, freezing of the tube is prevented. Unlike the downstream side, the upstream side is buried underground, so there is no risk of freezing without draining water. When the upstream side and the downstream side are communicated again, the ball valve 3 is rotated 90 ° and returned to the original position, and the upstream and downstream sides are communicated via the ball valve 3. Since the slot valve opening / closing plate 18 has an inclined surface 18a, the slot valve 24 is pushed downward by the inclined surface 18a and the slot valve sliding hole 22 is closed by the O-rings 32, 33 and the like. It

In this embodiment, since the hemispherical surface portion of the ball valve 3 that is in close contact with the valve seats 11 and 12 at the time of closing is not provided with an opening or the like as in the prior art, the ball valve 3 and the valve seat are separated from each other. Closeness is secured. The slot valve opening / closing plate 18 is released from the slot valve 24 only when the ball valve 3 is closed.

[0014]

[Effect of device]

 According to the present invention, the following remarkable effects are obtained. 1) Freezing does not occur because the water flow valve is opened in synchronization with the closing of the on-off valve, and the water accumulated downstream is automatically discharged to the outside. 2) The drain valve is built into the valve body and can be easily removed when not needed. 3) Since there is no opening on the rail surface of the on-off valve, the sealability can be improved.

[Brief description of drawings]

FIG. 1 is an axial sectional view showing the overall structure of an embodiment of the present invention.

FIG. 2 is a partial top view taken along the arrow A in FIG.

3 is an enlarged cross-sectional view taken along the line CC of FIG.

FIG. 4 is a partial axial sectional view showing a detailed structure of the drain valve and its surroundings according to the present embodiment.

FIG. 5 is a partial cross-sectional view showing a state in which the handle is rotated to close the valve passage and a drainage state from the state of FIG. 4;

FIG. 6 is a partial front view taken along the arrow B of FIG.

[Explanation of symbols]

 1 Antifreeze Water Stopper 2 Valve Body 3 Ball Valve 4 Coupling 5 Outlet Pipe 6 Union Nut 7 Sealing Member 8 Union Nut 9 Inflow Passage 10 Outflow Passage 11 Valve Seat 12 Valve Seat 13 Valve Passage 14 Stopcock 15 Stopper Rod 16 Handle 17 Screw 18 Slot valve opening / closing plate 19 Fixing ring 20 Drain valve 21 Opening hole 22 Slot valve sliding hole 23 Slot part 24 Slot valve 25 Slot retainer 26 Spring 27 Drain pipe 28 Drain channel 29 Check valve 30 Drain port 31 Protective cap 32 O Ring 33 O-ring

Claims (1)

[Scope of utility model registration request] 1. A plug main body, an opening / closing valve that is rotatably supported by the plug main body via a valve seat and that forms a valve passage that selectively communicates the upstream side and the downstream side, and the upstream of the plug main body. Water having an inflow pipe and an outflow pipe, which have an inflow passage and an outflow passage that are connected to the downstream side and the downstream side and communicate with the valve passage, and a drain valve that discharges the downstream water to the outside when the on-off valve is closed. The drainage valve includes an opening hole that opens downstream of the stopper body, a slot valve slidably supported by the stopper body to open and close the opening hole, and an opening of the slot valve. The drainage pipe with a check valve formed at a position that communicates with the opening hole at a time, abuttingly engaging with the slot valve to press the slot valve to a position for closing the opening hole, and the opening / closing valve side Slot valve open / close plate rotatably connected to And a spring for urging the slot valve in a direction to constantly push the slot valve toward the plate side, and the slot valve opening / closing plate is configured to release the contact with the slot valve when the opening / closing valve is rotated to the closed position. Antifreeze water stopper characterized by being formed.