JPH0234288Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a drain valve device for a water tank for a flush toilet.

The basic structure of the drain valve device of the present invention is shown in Japanese Unexamined Patent Publication No. 57-165544, but as shown in FIG. an outlet pipe 5 provided and fixed to the bottom 4 of the water tank;
an inner cylinder 11 that is connected to the upper end of the support cylinder 2 and constitutes a float chamber 10 with a cylinder inner wall 6, a cylinder outer wall 7, and a bottom wall 9 with a small hole 8; and a cylinder outer wall 7 of this inner cylinder 11.
a water-saving cylinder 15 whose lower end is fixed to the outlet pipe 5 and which has a side inlet 12 and is rotatably attached with a flap valve 14 with a weight 13 for opening and closing it; and a cylindrical inner wall 6 of the inner cylinder 11. an operating tube 1 extending through the tube and having a valve plate 16 at its lower end cooperating with the valve seat 3 of the outlet tube 5;
7, a stopper 18 fixed to the operating tube 17,
It consists of a float 19 disposed in a float chamber 10, and the operation tube 17 and flap valve 14 are connected to a handle device of the tank via beads 20 and 21, respectively, and when large cleaning is performed by operating the handle device, Only the operating tube 17 is operated, or for small cleaning, both the operating tube 17 and the flap valve 14 are operated. When the water tank is full, the water level is at operation pipe 17.
The drain valve device is located somewhat below the top end of the drain valve device, so that the entire drain valve device is submerged in water. During deep cleaning, when the operating tube 17 is pulled up by operating the handle device, the valve plate 16 separates from its valve seat 3 and opens.
The float 19 follows the upward movement of the stopper 18 fixed to the operating tube 17, floats above the water in the float chamber 10, and maintains the valve plate 16 in the open position. When the valve plate 16 is opened, the water level in the tank is lowered to the water saving cylinder 1.
A large amount of water is discharged into the outlet pipe 5 through the flow path between the cylindrical outer wall 7 of the inner cylinder 11 and the water-saving cylinder 15 and the inlet 12 of the water-saving cylinder 15 until reaching the lower edge of the inlet 12 of the water-saving cylinder 5 . On the other hand, after the water level in the tank reaches the upper edge of the inner cylinder 11, the water level in the float chamber 10 is reduced because the outflow of water is restricted by the small hole 8 in the bottom wall 9 of the inner cylinder 11. The float 19, which slowly lowers as the float 19 lowers, controls the lowering of the operating tube 17 via the stopper 18, so that the valve plate 16 slowly approaches the valve seat 3 and finally closes it. . When the water tank is refilled by a ball tap (not shown), it restores the water level mentioned above. Small flushing is performed by pulling up the operation pipe 17 by operating the handle, separating the valve plate 16 from its valve seat 3 to open the water, and at the same time rotating the flap valve 14 upward to close the inlet 12 of the water-saving cylinder 15. It is carried out with When the valve plate 16 is opened, the water in the tank passes through the flow path between the cylindrical outer wall 7 of the inner cylinder 11 and the water-saving cylinder 15 until the water level reaches the upper edge of the water-saving cylinder 15 and reaches the outlet pipe 5.
At this time, the flap valve 14 is kept in a closed state by being pressed against the inlet 12 of the water saving tube 15 due to the pressure difference generated between the inside and outside of the water saving tube due to the water flow passing through the flow path. be done. When the water level in the tank reaches the upper edge of the water-saving tube 15 and the water in the water-saving tube 15 flows out, the flap valve 14 is pressed against the inlet 12 by the water pressure around the water-saving tube 15 and closed. Maintained in valve state. The valve closing operation of the valve plate is the same as described above for the deep cleaning. When the drain valve device is submerged in water when water is supplied to the tank, the water pressure inside and outside of the water saving tube 15 becomes equal, so the flap valve 1
4 is opened downward by the action of the weight 13 to open the inlet 12 of the water saving cylinder 15.

In such a drain valve device, the inner diameter of the cylindrical inner wall is larger than the outer diameter of the operating tube. Therefore, if the operating tube is tilted when opening the valve, it will contact the inner wall of the cylinder over a large area, and a water film will form in the contact area.
The drawback was that the control tube was difficult to lower even when the water level fell. Furthermore, there were other drawbacks such as the operation tube being twisted and water scales adhering to the contact surface.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks and provide an inner cylinder that ensures the lowering of the operating tube after opening the valve. This object is achieved by providing a plurality of protrusions in the axial direction on the inner surface of the inner wall of the inner cylinder or on the outer surface of a portion corresponding to the cylindrical inner wall of the operating tube. Due to these protrusions, even if the operation tube were to tilt and come into contact with the inner wall when the valve was opened, there would be a considerable gap between the inner wall and the operation tube, so a film of water would not form, and the operation would be prevented. The tube descends steadily.

Now, to explain an example of the inner cylinder of the present invention with reference to the attached drawings, the inner cylinder 11 shown in FIGS. 2 and 3 has an inner cylinder inner wall 6, an inner cylinder outer wall 7, and a bottom wall provided with a small hole 8. 9
It consists of a float chamber 10. As shown in the figure, six protrusions 26 are provided on the inner peripheral wall of the inner wall 6 of the inner cylinder 11 in the axial direction and over the entire height thereof.
is provided. As shown in FIG. 2, the protrusions 26 are equally spaced along the inner circumference of the inner wall 6. As shown in FIG.
An imaginary circle 27 formed by the tip of the protrusion 26, indicated by a broken line, has a diameter slightly larger than the outer diameter of the operating tube.

In the drain valve device in which the operating pipe 17 is inserted into the inner wall 6 of the inner cylinder 11 having the above structure, the operating pipe 1 temporarily closes when the valve is opened.
7 tilts and comes into contact with the protrusion 26 provided on the inner wall 6, there is a gap between the operating tube and the inner surface of the inner wall by at least the height of the protrusion, so a water film will not form in the contact area. There is no twisting, no buildup of water scale, and the operation tube also descends reliably as the water level goes down.

In this embodiment, the protrusion 26 is provided over the entire height of the inner wall 6, but it may not be provided in the middle part of the inner wall, but may be provided divided into an upper part and a lower part. it is obvious. Further, in this embodiment, six protrusions are provided, but it is not necessarily limited to this, and a plurality of protrusions, preferably three or more protrusions, are provided. Furthermore, the protrusion may be provided on the outer periphery of the operating tube.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the drain valve device of the flush toilet water tank of the invention, Fig. 2 is a plan view of the inner cylinder of the invention, Fig. 3 is an elevational sectional view taken along line A-A in Fig. FIG. 4 is a perspective view of essential parts of the inner cylinder. 6... Cylinder inner wall, 11... Inner cylinder, 26... Projection, 17... Operation tube.

Claims (1)

[Scope of utility model registration request] An outlet pipe fixed to the bottom of the water tank and equipped with a valve seat, an inner cylinder that constitutes a float chamber with a cylindrical inner wall, a cylindrical outer wall, and a bottom wall having a small hole, and an outlet that extends through the inner cylinder wall of the inner cylinder and has an outlet at the lower end. A drain valve device for a water tank for a flush toilet, comprising an operating pipe having a valve plate cooperating with a valve seat of the pipe, a stopper fixed to the operating pipe, and a float disposed in a float chamber. 1. A drain valve device, characterized in that a plurality of protrusions are provided in the axial direction on an inner surface of a cylindrical inner wall of an inner cylinder of the valve device or on an outer surface of a portion of an operating tube corresponding to the cylindrical inner wall.