JPH02611Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a waterway backflow prevention device that prevents backflow from a bathtub or the like installed at a high position to a water supply or the like.

(Prior Art) Conventionally, a method of installing a check valve has generally been used to prevent backflow in waterways.

However, with this method, there is a risk that backflow will occur in the waterway if the check valve malfunctions, so it cannot be said to be a sufficiently safe method.

(Problems to be Solved by the Invention) The present invention aims to solve the above-mentioned conventional problems and provide a waterway backflow prevention device that can reliably prevent backflow in a waterway.

(Embodiments) The waterway backflow prevention device of the present invention (hereinafter referred to as the device of the present invention) will be described below according to embodiments shown in the drawings.

FIG. 1 shows an example of a waterway in which the device of the present invention is used, and the waterway 5 connects a water supply source 4 to a bathtub 1 installed at a high position.

The waterway 5 includes a blocking device 16 and a blocking device 16.
A check valve 15 is installed on the downstream side of each.

Further, a hot water heater 6 and a water solenoid valve 7 are installed in the water channel 5 between the water supply source 4 and the shutoff device 16.

Next, the shutoff device 16 has a water chamber 19 attached to the water channel 5 as shown in FIG.

At the upper part of the water chamber 19, there is a front chamber 2 connected to the water channel 5 on the upstream side and communicating with the water chamber 19 at an inlet 20.
1 is provided.

A diaphragm 23 for opening and closing the inlet 20 is attached to the front chamber 21.

The diaphragm 23 has a hole 24 provided at a position corresponding to the inlet 20.

Further, the diaphragm 23 is provided with another hole 25 around the hole 24.

The holes 24 and 25 described above allow the back chamber 22 formed on the back surface of the diaphragm 23 to communicate with the front chamber 21.

A plunger 26 is then provided to open and close the hole 24 in the diaphragm 23, and the plunger 26 is driven by a solenoid 27 and a spring (not shown).

On the other hand, a drain passage 18 is connected to the side surface of the water chamber 19, and a valve 29 that is driven by a solenoid 30 and a spring 31 to open and close the drain passage 18 is attached to the drain passage 18.

Further, a water flow sensor 10 (see FIG. 1) which outputs the drive signals of the solenoid 27 and the solenoid 30 and is installed in the water channel 5 on the upstream side of the shutoff device 16
A controller 32 is provided which inputs the detection signal of.

The operation of the apparatus of the present invention shown in the above embodiments will be explained next.

That is, when supplying hot water to the bathtub 1, the solenoid 27 is energized by instructions from the controller 32,
As shown in FIG. 2, the plunger 26 is raised to open the hole 24 in the diaphragm 23.

Furthermore, the solenoid 30 is energized by instructions from the controller 32, and the drain passage 18 is closed by the valve 29.

In this state, the water electromagnetic valve 7 is opened and hot water (heated by the hot water heater 6) flows into the water channel 5.

Hot water flows into the front chamber 21 of the shutoff device 16, pushes up the diaphragm 23, and passes through the inlet 20 to the water chamber 1.
It reaches 9.

Furthermore, hot water flows out from the water chamber 19 into the water channel 5 and flows into the bathtub 1 through the check valve 15.

The above is a normal operating state, but for example, during operation (when the water solenoid valve 7 is open), the water supply source 4
water supply may be cut off.

In this case, the water pressure of the water supply source 4 decreases, and the hot water in the bathtub 1 tends to flow backward through the waterway 5.

This backflow is prevented in the check valve 15 when the check valve 15 operates normally.

On the other hand, an abnormality in the flow state of the water channel 5 due to a decrease in the water pressure of the water supply source 4 is detected by the water flow sensor 10.

Upon detection of this abnormality, the controller 32 demagnetizes the solenoid 27 and demagnetizes the solenoid 3.
0 is also demagnetized.

As a result, the plunger 26 descends as shown in FIG. 3, and the hole 24 of the diaphragm 23 is closed.

Thereby, the water supply pressure of the front chamber 21 is introduced to the rear chamber 22 through the hole 25.

As a result, the force acting on the upper surface of the diaphragm 23 overcomes the force acting on the lower surface (the force acting on the lower surface is small due to the low pressure at the center due to the inlet 20), and the diaphragm 23 falls and closes the inlet 20.

On the other hand, due to the demagnetization of the solenoid 30, the valve 29 is
As shown in the figure, it is pushed up by the spring 31 and the drain passage 18 is opened.

As a result of the above, even if the check valve 15 fails, the backflow that passes through the check valve 15 will not be discharged from the water chamber 19 to the drain path 18 and reach the front chamber 21.

(Effects of the invention) The embodiments of the waterway backflow prevention device of the invention are as described above, and the effects thereof are listed below.

(1) The device of the present invention has the configuration described in the scope of the utility model registration claim, and in particular has a water chamber of the shutoff device installed in the waterway and a drain passage connected to the side of the water chamber, so that it can prevent backlash. Even in the event of a valve failure, backflow is discharged to the drain path, and backflow in the waterway is reliably prevented.

(2) The device of the present invention has the same configuration as above, and because it reliably prevents backflow in waterways, hot water (or ) can be carried out with peace of mind.

[Brief explanation of the drawing]

FIG. 1 is a schematic overall view showing an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of the main parts of the present invention, and FIG. 3 is a vertical cross-sectional view of the main parts at the time of stoppage or abnormality. 1...Bathtub, 4...Water supply source, 5...Waterway, 6...
...Hot water heater, 7...Water solenoid valve, 10...Water flow sensor, 15...Check valve, 16...Shutoff device, 1
8... Drain passage, 19... Water chamber, 20... Inlet, 21... Front chamber, 22... Back chamber, 23... Diaphragm, 24... Hole, 25... Hole, 26...
Plunger, 27... Solenoid, 29...
Valve, 30...Solenoid, 31...Spring, 32...
…controller.

Claims (1)

[Scope of utility model registration request] A water chamber of the shutoff device attached to the water channel, a front chamber provided at the upper part of the water chamber and connected to the upstream water channel and communicating with the water chamber at the inlet, and a front chamber attached to the front chamber and connected to the inlet. A diaphragm that opens and closes, a hole provided in the diaphragm at a position corresponding to the inflow port, other holes provided in the diaphragm around the hole, a back chamber formed on the back surface of the diaphragm, and a rear chamber formed on the back surface of the diaphragm. a plunger that opens and closes a hole corresponding to the inlet; a solenoid that drives the plunger; a drain passage connected to a side surface of the water chamber; a valve that opens and closes the drain passage and is driven by the solenoid; A waterway backflow prevention device consisting of a controller that outputs drive signals from two solenoids and receives a detection signal from a water flow sensor installed in the waterway upstream of the shutoff device.