JP3041333U - Stopcock with check function - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a water stopcock with a non-return function, which has a small head loss and can be used even in a low water pressure location. SOLUTION: A stopper body 11 is inclined with respect to a flowing direction of a stopper body 1. The coil spring 1 is attached to the plug body 12 in the plug body 11.
The back surface pressing force by 8 is acting. When the stopper rod 14 is rotated, the stopper body 15 moves diagonally in the vertical direction. A connecting portion 2 is replaceably attached to the outlet side 22 of the stopper body 1.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 This invention relates to a water stopcock having a backflow prevention function, which is mainly used for water supply.

[0002]

[Prior art]

 A water stopcock having a backflow prevention function has already been proposed by the present inventor as Japanese Utility Model Publication No. 4-19266. The structure of this water stopcock is to support the stopper body with a small back pressure applied by a coil spring, and to attach the stopper body retainer to the stopper rod. For this reason, when the stopper rod is tightened, the stopper body is pushed by the stopper body and comes into close contact with the valve seat to completely stop water.When the stopper rod is loosened, the stopper body receives a weak back pressure. When the water hammer occurs, the plug will stick to the valve seat and prevent backflow when the water hammer etc. occurs. To do.

[0003]

[Problems to be solved by the device]

However, in the conventional stop cock, since the stopper body is provided upright in the flowing direction, there is a problem that the detour distance of the flowing water is long and the head loss is large. For this reason, when it is used in a place with low water pressure, for example, when it is used to drop a tank in an apartment house, the water pressure is only about 1 kgf / cm ^2, so water flow may be impaired and the water heater may ignite. There is a risk of problems such as being missing.

In view of the above, the present invention aims to provide a water stopcock with a check function that can be used even in a low water pressure location by reducing the head loss. Further, the present invention is to provide a water stopcock in which the pipe connecting portion can be freely replaced and used with a different type. In addition, the present invention provides a water stopcock in which a drain discharge hole can be freely provided on either the left or right side of the stopper.

[0005]

Means for Solving the Problems The technical means of a water stopcock of the present invention is a stopper body provided in an inclined shape with respect to a flowing direction of a stopper body, and a spring biased from a rear surface, which is housed in the stopper cylinder. It is composed of a stopper body and a stopper body screwed to a rotatable rotation stopper rod.

Further, the connecting portion may be replaceably attached to the outlet side of the stopper body.

Further, bulging seats may be formed on the outer walls of the bottom of the plug body on the left and right sides, and a drain discharge hole may be formed in one of the seats so that the drain plug can be opened and closed. Good.

[0008]

[Embodiment of the invention]

 The embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, 1 is a plug main body, 2 is a replaceable connecting portion, 3 is an operating handle, and 4 is a water pressure gauge attached as required.

FIG. 2 shows details of the internal structure. The stopper body 11 is inclined with respect to the flowing direction of the stopper body 1. Although the inclination angle is 45 ° in the embodiment, this angle can be freely set. A stopper 12 is housed inside the stopper cylinder 11, and the stopper 12 is movable in an obliquely vertical direction.

A packing box 13 is fixed to the upper end of the stopper cylinder 11. A plug bar 14 penetrates through the packing box 13, and the plug bar 14 is rotatable by the handle 3. A stopper body 15 is screwed onto the stopper rod 14, and when the stopper rod 14 is rotated, it moves diagonally in the vertical direction. FIG. 2 shows a state in which the stopper rod 14 is tightened, and the stopper body pressing member 15 is at the lowest position and holds the upper surface of the stopper body 12. For this reason, the packing portion 16 at the lower end of the plug body 12 comes into close contact with the valve seat surface 17 to block water flow.

When the stopper rod 14 is rotated in the opposite direction, the stopper body pressing member 15 moves obliquely upward so that the stopper body 12 can move freely. A weak coil spring 18 is interposed between the plug body 12 and the plug body retainer 15. Therefore, the plug body 12 is always subjected to the back surface pressing force by the spring and is biased in the shielding direction. However, since the force of the spring 18 is small, water can flow from the inflow side 21 to the outflow side 22 by pushing the plug 12 open by the water pressure. Reference numeral 23 is a cushioning material provided on the contact surface.

A thin water passage hole 24 is provided in the center of the stopper rod 14. This hole 22 is normally shielded at its upper end by a stop screw 25. However, if the screw 25 is removed and the water pressure gauge 4 is attached to the screw 25, the water pressure inside the stopper can be measured. With this configuration, water pressure can be easily measured as needed, which is extremely convenient in practice.

A connecting portion 2 is attached to the outflow side of the water stopcock. Reference numeral 26 is an inner screw formed at the outlet. The type of the connecting portion 2 is arbitrary. In Fig. 2, a telescopic type is attached. In the figure, 31 is a holder, which is screwed and fixed to the inner screw 26 of the outlet of the plug body 1. A short tube 32 is fitted on the inner surface of the holder 31 so as to be movable in the axial direction. 33 is a cap nut screwed to the holder 31, 34 is a packing, and 35 is a cap nut attached to the tip of the short pipe.

A drain discharge hole 41 is formed at the lower end of the plug body 1. As shown in FIG. 3 for details, a bulging seat portion 42 is provided on the outer wall of the plug, and a drain discharge hole 41 is formed therein. Reference numeral 43 denotes a drain plug, and normally the drain discharge hole 41 is shielded. Only when necessary, the drain plug 43 is removed to drain the drain from the stopper. As shown in FIG. 3, since the bulging seat portions 42 are provided on both left and right sides, the drain discharge hole 41 can be formed by piercing the seat portion on the desired side. This requires only one die for casting the plug body, which is practically useful.

FIG. 4 shows an embodiment in which another type of connecting portion is attached. This connecting part 51 has the simplest shape and has only an internal thread.

Next, the operation of the present invention will be described. First, as shown in FIG. 2, when the stopper rod 14 is tightened, the rear end of the stopper body 12 is pressed by the stopper retainer 15, and the packing portion 16 of the stopper 12 presses against the valve seat surface 17. So the water flow is completely blocked. Next, in the state where the stopper rod 14 is loosened, the stopper body 15 rises, so that the stopper body 12 becomes movable. The plug 12 is biased from the back side by the spring 18, but its force is weak, so the plug 12 is pushed up by water pressure, and water flows from the inflow side 21 to the outflow side 22. In the present invention, since the plug cylinder 11 is provided obliquely, the bypass distance of the water flowing from the inflow side 21 to the outflow side 22 is smaller than that of the conventional one in which the plug cylinder is installed upright. The head loss during running is low. FIG. 5 shows a graph of the results of the comparison test of the head loss in the case of the stopcock of the embodiment of the present invention having a diameter of 20 mm and the conventional one. As can be seen from this graph, the head loss of the present invention is 1/2 to less than that of the conventional head at all flow rates, and the head loss of the present invention is 40% / min at the specified flow rate. The conventional type has a flow rate of 3.7 m, while the conventional type has a flow rate of 3.7 m, and the JWWA standard flow rate of 70 liters / min is 3.4 m for the conventional type. It is 9.8m. As described above, in the present invention, since the loss during running water is small, it is suitable for use in a place with low water pressure.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and can be freely modified and implemented within the scope of the claims of the utility model. In particular, the inclination angle of the stopper body, the structure of the stopper body and stopper body, and the shape of the outlet can be freely selected.

[0018]

[Effect of the invention]

 Since the stopcock of the present invention has a slanted barrel, the bypass distance of running water is short and the head loss is smaller than that of the conventional one. For this reason, it can be used in a place with a low water pressure that cannot be used by the conventional one, and has a great advantage in practical use. Furthermore, with the water stopcock according to the present invention, in the event of a water hammer, the stopper comes into contact with the valve seat surface to prevent backflow and prevent damage accidents.

According to the second aspect of the present invention, since the connecting portion is replaceable, adjustment is possible according to the application, which is extremely convenient.

According to the third aspect, the drain inside the stopper can be easily removed, and the drain discharge hole can be formed on either the left or right side. Two molds for the stopper main body are prepared. Since it is not necessary to keep it in advance, the manufacturing advantage is great.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of the water stopcock of the present invention.

FIG. 2 is a sectional view.

FIG. 3 is a sectional view showing a drain discharge hole.

FIG. 4 is a partially cutaway front view of an embodiment using another connecting portion.

FIG. 5 is a graph of a comparative test of head loss.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plug main body 2 Connection part 3 Operation handle 11 Plug body 12 Plug body 13 Packing box 14 Plug rod 15 Plug body retainer 16 Packing part 17 Valve seat surface 18 Coil spring 21 Inflow side 22 Outflow side 24 Water through hole 25 Stop screw 26 Screw 41 Drain discharge hole 42 Swelling seat 43 Drain plug

Claims (3)

[Utility model registration claims] 1. A stopper barrel 11 provided in an inclined shape with respect to a flowing direction of a stopper main body 1, a stopper body 12 housed in the stopper barrel and biased from a rear surface by a spring, and a rotatable stopper rod 14. A water stopper with a non-return function, which is composed of a stopper body 15 screwed into the. 2. The water stopper with a check function according to claim 1, wherein the connecting portion 2 is replaceably attached to the outlet side 22 of the stopper body 1. 3. A bulging seat portion 42 is formed on the bottom outer wall on both left and right sides of the plug body 1, and the drain discharge hole 4 is formed on either side thereof.
1 is provided, and the drain discharge hole 41 is provided with a drain plug 4
The water stopcock with a non-return function according to claim 1, which is shielded by 3 so as to be openable and closable.