JPH0441366Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a constant flow device with a water stop valve that is effective when applied to a washing control device that automatically controls the flow of washing water into the urinals of public men's restrooms.
In particular, the present invention relates to a constant flow rate device with a water stop valve that can always maintain a constant flow rate of water supply without being affected by fluctuations in water supply pressure.

Controlling the supply of flushing water to the toilet bowl only when flushing is necessary is extremely important from the perspective of saving water. On the other hand, from a sanitary standpoint, it is desirable that washing water be always supplied after use.

Several automatic cleaning methods have already been proposed to meet these demands. The most common method is called the automatic siphon method, in which water is continuously supplied at a small flow rate to a tank installed at a high position (high tank).
When the water level in the high tank reaches a predetermined height, an automatic siphon is activated to flush out the wash water, which is repeated. However, since water is constantly supplied, the cleaning cycle is almost constant, and cleaning is performed even during times when it is hardly used, so it cannot be said to be sufficient from the standpoint of water conservation. In order to improve the water-saving effect, a method is being considered in which the use of the toilet is detected using signals from a human body sensor, a door switch, a light switch, etc., and water is supplied to the high tank for a certain period of time from the time of this detection. In this case, the cleaning water does not flow when not in use, but the operation of supplying water from the time of detection to the activation of the automatic siphon is controlled solely by the time element, so it is possible to If there is a fluctuation in water pressure caused by a belt, etc., the amount of water supplied to the high tank within the time set by the timer will change, causing more water to flow than the required amount, or the water level not reaching the automatic siphon activation level. Therefore, it is easy for the washing water to not flow.

The purpose of this invention is to be able to supply a high tank with an automatic siphon with a constant flow of water each time the use of the toilet bowl is detected, regardless of the water pressure on the supply side. It is an object of the present invention to provide a constant flow rate device with a water stop valve that can reliably supply the minimum necessary amount of flushing water to a toilet bowl.

First, an overview of a toilet flushing system to which the constant flow device with a water stop valve of this invention is applied will be explained with reference to FIG. In FIG. 1, a water supply system line 2 for supplying water to a high tank 1 includes a manual water stop valve 3 which is normally kept open, an electromagnetically driven water supply valve 4 and a differential pressure generating mechanism. A constant flow rate device 6 with a water stop valve is provided. This water stop valve 4
is driven to open in response to a signal from the controller 9 when the use of one of the toilet bowls 7 is detected by a suitable sensor 8, thereby supplying water to the high tank 1 through the water supply line 2. is supplied.
In this case, the differential pressure generating mechanism 5 extracts the water pressure upstream and downstream of the water supply valve 4, that is, the difference between the water supply pressure and the drainage pressure, and the aperture is changed according to the extracted differential pressure to keep the differential pressure constant. This makes the supply water a constant flow rate.

The high tank 1 is equipped with a normal automatic siphon (not shown), and when the water level in the high tank 1 reaches the operating water level of this automatic siphon, the water in the high tank 1 passes through the flush water system path 10 to each toilet bowl 7. It is now being supplied to

Therefore, by controlling the opening time of the water supply valve 4 to a constant value using, for example, a timer built into the controller 9, the water supply amount can always be kept constant. Then, the water supply valve 4 is closed in response to a time-up signal from the timer, thereby stopping the water supply to the high tank 1. The set value of the water supply amount in the controller 9 is the high tank 1
The water level in the automatic siphon is selected to be slightly larger than the amount of water required to raise the water level to the operating level of the automatic siphon. The siphon operates, and immediately after that, the water cutoff valve 4 is closed. This operation is completely unaffected by fluctuations in the water pressure on the water supply side acting on the water supply line 2.

FIG. 2 shows an example of a specific structure of the constant flow rate device 6 with a water stop valve of this invention. This constant flow device 6 with a water stop valve has an inlet port 12 and an outlet port 13 in a housing 11, and a flow path 14 leading from the inlet port 12 to the outlet port 13, and a valve seat is located in the middle of this flow path. 29 is formed. The outer cylindrical body 15 is disposed on the center line of the valve seat 29 with its axis perpendicular to the flow path. A circumferential groove 16 and a number of ports 17 penetrating inside the circumferential groove 16 are formed on the circumferential surface of the outer cylinder 15 and on the bottom surface of the circumferential groove.

Further, a sliding body 18 with an open lower end is provided in the outer cylinder 15 so as to be freely slidable. A circumferential groove 19 and a port 20 penetrating inward from the bottom surface of the circumferential groove are formed on the circumferential surface of the sliding body 18. The circumferential groove 16 and the port 17 constitute a throttle mechanism.

The pressure varying chamber 21 of the outer cylinder, which is partitioned by the sliding body 18, is connected to the flow path 14 upstream of the outer cylinder 15 by a pilot flow path 22. This pilot flow path 22 is provided with a solenoid valve 23 for opening and closing the pilot flow path. This solenoid valve 23 is a plunger 2 of an electromagnetic solenoid 24.
5, and is normally pressed to the closed position by a spring 26, but moves to the open position when the electromagnetic solenoid 24 is energized.

Further, a valve body 28 is attached to the sliding body 18 via a connecting shaft 27, and this valve body 28 is in contact with the valve seat surface facing the outlet port side flow path so as to open and close the valve seat 29. It's starting to move away.

A communication passage 30 is formed in the connecting shaft 27 to communicate the pressure fluctuation chamber 21 and the outlet port side flow passage, and this communication passage 30 is provided with an orifice 31. Further, a spring 32 is always attached to the valve body 28.
A pressing force is applied in the closing direction, and this pressing force can be adjusted by the screwing amount of the spring seat 33 screwed into the housing 11.

Now, when the electromagnetic solenoid 24 is not energized, the electromagnetic valve 23 is pressed by the spring 26 and closes the pilot flow path. Therefore, the pressure in the pressure fluctuation chamber 21 becomes the pressure P ₂ in the outlet port side flow path, and the pressure inside the sliding body 18 becomes the pressure P ₁ in the inlet port side flow path. In this case, since P ₁ > P ₂ , the sliding body 18
is pushed up by the pressure difference (P ₁ −P ₂ ) and the pressing force of the spring 32, and holds the valve body 28 in the closed position. In other words, the valve body 28 functions as a water stop valve.

Next, when the electromagnetic solenoid 24 is energized, the plunger 25 is pulled up against the spring 26, so that the electromagnetic valve 23 is connected to the pilot flow path 22.
open. Therefore, the pressure in the pressure fluctuation chamber 21 becomes the pressure P ₁ in the flow path on the inlet port side, and this pressure pushes down the sliding body 18 to open the valve body 28, and the pressure inside the sliding body 18 changes to the pressure P1 in the flow path on the outlet port side. The pressure of P ₂
becomes. Therefore, the sliding body 18 moves due to the pressure difference (P ₁ -P ₂ ) acting on the inner and outer surfaces until the pressure difference balances with the pressing force of the spring 32.

In this case, if the above pressure difference (P ₁ − P ₂ ) is large,
The amount of movement of the sliding body 18 is large, and the amount of restriction of the throttling mechanism composed of the circumferential groove 16, the port 17, the circumferential groove 19, and the port 20 is large, and on the other hand, the pressure difference (P ₁ - P ₂ ) is small. Then, the throttle amount of the throttle mechanism decreases, and the water supply amount becomes approximately constant.

As described above, according to this invention, the amount of water supplied can always be maintained at a constant rate without being affected by fluctuations in water supply pressure, and by specifying the water supply time with a timer, it can be reliably quantified. can be supplied.

Therefore, when the constant flow rate device with a water stop valve of this invention is applied to a toilet flushing system, it is possible to automatically supply a fixed amount of water to the high tank when the use of the toilet is detected, and The amount of water supplied at this time is completely unaffected by fluctuations in water pressure on the water supply side, so a stable cleaning operation is always performed, and no excess water is flushed, which helps save water. This effect can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an overview of a toilet flushing system to which the constant flow rate device with a water stop valve of this invention is applied, and Fig. 2 is a longitudinal section showing an embodiment of the constant flow rate device with a water stop valve of this invention. It is a front view. 1...High tank, 2...Water supply system line, 4...Water supply valve, 5...Differential pressure generation mechanism, 6...Constant flow device with water stop valve, 7...Toilet, 8...Sensor , 9...
Controller, 10... Washing water system path, 11... Housing, 12... Inlet port, 13... Outlet port, 14... Channel, 15... Outer cylinder body, 17, 2
0...Port, 18...Sliding body, 21...High pressure chamber, 22...Pilot channel, 23...Solenoid valve,
28...valve body, 29...valve seat, 32...spring.

Claims (1)

[Claims for Utility Model Registration] (1) A flow path formed between an inlet port and an outlet port, and a valve seat formed in the middle of the flow path;
an outer cylindrical body having a port on its circumferential surface disposed with an axis passing through the valve seat and perpendicular to the flow path; and an outer cylindrical body having a port on its circumferential surface that forms a throttle mechanism with the port a pilot flow path that connects the pressure fluctuation chamber of the outer cylindrical body partitioned by the slider to an inlet port side flow path; and a pilot flow path that opens and closes the pilot flow path. a solenoid valve that opens and closes the valve seat, a valve body that is attached to the sliding body via a connecting shaft to open and close the valve seat, and a valve body that is formed on the connecting shaft to connect the pressure fluctuation chamber and the outlet port side flow path. A constant flow rate device with a water stop valve, comprising: a communicating path, an orifice provided in the communicating path, and a spring that applies a pressing force in a closing direction to the valve body. (2) The constant flow rate device with a water stop valve according to claim (1) of the utility model registration, wherein the pressing force of the spring is adjustable.