JPS594209Y2 - Vacuum breaking device for flush toilets - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vacuum breaking device interposed between a water supply valve and a water supply pipe to the toilet bowl in a flush toilet.

FIG. 4 and subsequent figures are for explaining the prior art.

As shown in FIG. 4, a simple flush toilet does not use a water tank, but connects a water supply pipe directly from the water supply 11 into the toilet bowl 12, and opens the water supply valve 13 to supply water from the water supply 11. is supplied directly into the toilet bowl 12.

However, in this type of flush toilet, if the pressure on the water supply 11 side decreases after the water supply is completed, there is a risk that the dirty water will flow back to the water supply side.

Therefore, a vacuum breaking device 20 is installed in the middle of the pipe to introduce outside air into the pipe after water is supplied, thereby preventing the above-mentioned backflow.

FIGS. 5 and 6 are vertical cross-sectional views of a conventional vacuum breaking device.

The vacuum breaking device 20a shown in FIG. 5 is of a spring type.

This vacuum breaking device 20a is connected to a water supply channel 21 through which water from the water supply 11 flows, and an air supply channel 22 that branches off from the water supply channel 21.

Air supply holes 23 a and 23 b are bored at the tip of the air supply path 22 , and one of the air supply holes 23 a is closed by a valve 24 .

Further, this valve 24 is integrally provided with a shaft 25, and the valve 24 is urged upward by a spring 26 mounted on the shaft 25, thereby closing the air supply hole 23a.

After using the toilet, when the water supply valve 13 shown in FIG. 4 is opened, water from the water supply 11 is supplied into the toilet bowl 12 through the water supply channel 21 of the vacuum breaker 20a.

When the water supply valve 13 is closed again, the water supply is stopped, but at this time, the pressure on the lower side of the water supply channel 21 decreases, so the valve 24 is pulled downward against the force of the spring 26.

As a result, the air supply hole 23a is opened, and the air supply hole 23a is opened.
Outside air is introduced into the air supply path 22 from a and 23b, and the waterway in the pipe is cut off.

However, with this conventional spring type toilet bowl 1
When the valve 24 is pulled after water has been supplied to the valve 2, the valve 24 itself may vibrate and generate abnormal noise.

Further, when the spring 26 is broken, the valve 24 does not close the air supply hole 23a, and when water is supplied, the air supply hole 23a is closed.
, 23b has drawbacks such as water leakage.

Next, the vacuum breaking device 20b shown in FIG. 6 is of a lever type.

Similar to the one shown in FIG. 5, this vacuum breaking device 20b has a branched internal supply channel 21 and an air supply channel 22, and an air supply channel 23a at the tip of the air supply channel 22. and 23
b is drilled.

In addition, a lever 28 with the pin 27 as a fulcrum is provided inside the air supply path 22.
is rotatably provided, and one side of this lever 28 has a valve 29 that closes the air supply hole 23a, and the other side has a valve 29 that closes the air supply hole 23a.
A pressure valve 30 located within 1 is provided.

When the water supply valve 13 shown in FIG. 4 is opened after using the toilet, water from the water supply 11 passes through the water supply channel 21, but the water supply pressure at this time pushes the pressure valve 30 downward, and this force causes the valve 29 to close. It is designed to close the air supply hole 23a.

After the water supply is finished, the pressing force on the pressure valve 30 decreases, so the valve 29 is lowered, the air supply hole 23a is opened, and outside air is introduced into the air supply path 22 through the air supply holes 23a and 23b. be done.

The inside of the pipe is divided into upper and lower sections, thereby preventing backflow of sewage.

However, in the conventional example shown in FIG. 6, the pressing force of the valve 29 changes due to changes in the flow rate in the water supply channel 21, which tends to cause malfunctions and water leaks.

The present invention solves the above-mentioned problems in flush toilets, and aims to provide a vacuum breaking device that has a simple structure and does not cause water leakage.

The vacuum breaker for flush toilets according to the present invention has an air inlet at the upper end of the tube, a drain at the lower end of the tube, and an airtight chamber inside the tube. An air passage connecting the air inlet and the drain port is provided in a detour, a water supply channel for supplying water from the water supply is connected to the airtight chamber, and a cylindrical slide valve whose upper end is open inside the airtight chamber. A passage is formed at the bottom of the slide valve to communicate between the airtight chamber and the inside of the slide valve, and at the lower end of the slide valve, when the slide valve is raised, the airtight chamber and the drainage water are connected to each other. A drainage passage is provided to communicate with the hole, and a float valve is installed inside the slide valve so as to be able to move up and down, and the air inlet port can be closed by the upper end of the float valve. The two-stage operation ensures that outside air can be shut off and introduced.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing the overall configuration of a vacuum breaking device for water washing.

Reference numeral 1 in the figure is a tube.

A cap 2 is attached to a backing 3 at the upper end opening of the tube body 1.
It is screwed through.

An air inlet 2a is opened in the center of the cap 2, and a backing 4 is attached around the lower surface of the air inlet 2a.

A cover 5 is attached to the upper side of the cap 2, and the cover 5 is provided with several air passages 5a that communicate with the outside air.

An airtight chamber A is formed in the center of the tube body 1, and this airtight chamber A is connected to a drain port 1 at the lower end of the tube body 1 by a lower end passage 1a.
It is now possible to communicate with b.

Note that this drain port 1b is connected to a toilet bowl 12 (see FIG. 4).

Further, an air passage B is formed on the side of the pipe body 1, bypassing the airtight chamber A and connecting the air inlet 2a and the drain port 1b.

A water supply channel IC is connected to the midsection of the pipe body 1, and this water supply channel 1C communicates with the inside of the airtight chamber A.

Note that this water supply IC is connected to the water supply 11 via the water supply valve 13.
(See Figure 4).

Further, a slide valve 6 is installed inside the airtight chamber A.

The slide valve 6 is formed of metal into a cylindrical body with an open upper end, and a flange portion 6a around the upper end slides against the inner surface of the airtight chamber A and is movable in the vertical direction.

A cylindrical body 6b which is open at the bottom is integrally formed at the lower end of the slide valve 6, and this cylindrical body 6b is connected to the lower end passage 1a.
It is designed to be able to slide inside.

The inside of the slide valve 6 and the inside of the cylindrical body 6b are connected through a small hole 6C.

Further, a passage 6d connecting the inside of the slide valve 6 and the airtight chamber A is bored in the lower circumference of the slide valve 6, and a drainage passage 6e is bored in the circumference of the cylinder 6b. There is.

Furthermore, a small hole 6f is bored in the flange portion 6a.

A float valve 7 is installed inside the slide valve 6.

This float valve 7 is composed of a cylindrical body part 7a provided on the inner surface of the slide valve 6 so as to be movable up and down, and a check ball 7b that abuts on the upper surface of this cylindrical body part 7a.

Both the cylindrical body portion 7a and the check ball 7b are made of resin and are lightweight.

Next, the operation and effects of the present invention will be explained.

Figure 1 shows a state where water supply is stopped.

At this time, the air introduction port 2a is open, and air enters the inside of the tube body 1.

Next, the water supply valve 13 disposed on the upstream side of the water supply channel IC
(See FIG. 4) is opened and water is supplied from the water supply channel 1C into the pipe body 1. This water first flows into the airtight chamber A and then enters the inside of the slide valve 6 through the passage 6d.

Since the cylindrical portion 7a of the float valve is made of lightweight resin, it immediately rises due to the pressure of the water flowing into the slide valve 6.
The check ball 7b comes into pressure contact with the backing 4 around the lower surface of the air inlet 2a, and the air inlet 2a is closed (
(Situation shown in Figure 2).

When the pressure within the airtight chamber A further increases, the lower surface of the flange portion 6a of the slide valve 6 is pushed upward, causing the slide valve 6 to rise.

Then, the drain passage 6e reaches the inside of the airtight chamber A, and the inside of the airtight chamber A and the drain port 1b are communicated through this drainage passage 6e (the state shown in FIG. 3).

Therefore, water supplied from the water supply channel 1C passes from inside the airtight room A through the drainage passage 6e, and is sent from the drainage port 1b to a pipe leading to a toilet bowl or the like.

In addition, in the above operation, the cylindrical body part 7a and the check ball 7b forming the float valve are made of resin and are lightweight, while the slide valve 6 is made of metal and is heavy, so water does not flow into the airtight chamber A. Then, the lightweight cylindrical body 7a and the check ball 7b rise first, and immediately after the air inlet 2a is closed, the heavy slide valve 6 rises and the drain port 1b is closed.
Water is sent in the direction.

Therefore, leakage of water from the air introduction port 2a is reliably prevented.

Furthermore, the higher the water pressure, the greater the force with which the check ball presses against the air introduction port 2a, so there is no water leakage.

Next, when the water supply valve located upstream of the water supply channel IC is closed and the supply of water into the pipe body 1 is stopped, the slide valve 6, the cylindrical body part 7a, and the check ball 7b descend by their own weight, and the air inlet 2a is opened.

As a result, air flows into the air passage B from the air passage 5a and the air introduction port 2a of the cover 5, and the water inside the pipe body 1 flows out into the toilet bowl or the like.

Further, the water remaining in the airtight chamber A is discharged toward the drain port 1b through the small hole 6C due to air flowing through the small hole 6f.

In this manner, air flows into the pipe body 1, thereby preventing a vacuum from being created in the flush pipe leading to the toilet bowl, etc., and preventing phenomena such as backflow of sewage.

As described above, according to the present invention, the slide valve and the float valve are installed coaxially within the pipe body, and the air inlet is closed by these two valves, so that the entire structure is small. It is lightweight.

In addition, the float valve rises first, then the slide valve rises to open the valve, and the float valve closes the air inlet, ensuring that the air inlet is closed. This has the effect of reliably preventing water leakage from the air inlet.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and Fig. 1 is a vertical cross-sectional view showing the water supply stopped state, Fig. 2 is a partial longitudinal cross-sectional view showing the float valve raised by water pressure, and Fig. 3 is a sliding FIG. 3 is a longitudinal cross-sectional view showing a state in which the valve is raised. FIG. 4 and subsequent figures show a conventional example. FIG. 4 is a piping diagram of a simple flush toilet, and FIGS. 5 and 6 are longitudinal sectional views of a conventional vacuum breaking device. 1...Pipe body, 1b...Drain port, IC・
... Water supply channel, 2a ... Air inlet, 6.
...Slide valve, 6b...Cylinder body, 6d.
...Passage, 6e...Drainage passage, 7a. 7b...Float valve, A...Airtight chamber,
B...Air passage.

Claims (3)

[Scope of utility model registration request] (1) An air inlet is formed at the upper end of the tube, a drain is formed at the lower end of the tube, and an airtight chamber is formed inside the tube, and an air inlet is connected to the air inlet by bypassing the airtight chamber. An air passage connecting the drain port is provided, a water supply channel for supplying water from the water supply is connected to the airtight chamber, and a cylindrical slide valve with an open top end is installed inside the airtight chamber so as to be movable up and down. A passage is formed at the bottom of the slide valve to communicate the airtight chamber with the inside of the slide valve, and a drainage passage is formed at the lower end of the slide valve to communicate the airtight chamber and the drain port when the slide valve is raised. A vacuum breaking device for a flush toilet, further comprising a float valve movable up and down inside the slide valve, and the air inlet port can be closed by the upper end of the float valve. (2) The lower end of the slide valve is provided with a cylindrical body that slides within the lower end passage of the airtight chamber, the lower end of this cylindrical body is open, and a drainage passage is provided around this cylindrical body. A vacuum breaking device for flush toilets as set forth in claim 1 of the utility model registration claim. (3) The float valve is comprised of a cylindrical body that slides on the inner surface of the slide valve, and a check ball that abuts the upper surface of the cylindrical body and abuts the air inlet. A vacuum breaking device for flush toilets as described in Scope 1.