JPH0218425Y2 - - 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 and a bathtub 1 installed at a high position.

Further, the water channel 5 is equipped with a hot water heater 6 and a water solenoid valve 7 for opening and closing the water channel 5.

Furthermore, the waterway 5 is provided with a shutoff device 16 and the shutoff device 1.
A check valve 15 is installed on the downstream side of 6.

The shutoff device 16 is connected to the waterway 5 as shown in detail in FIG.
The main body 20 is attached to the main body 20 and has a cylinder chamber 21 formed therein.

A valve body 22 is slidably mounted in the cylinder chamber 21.

The valve body 22 is provided with a hole 23 that communicates the upstream side with the downstream side.

Further, a sealing material 27 is attached to the side surface of the valve body 22, and a sealing material 26 is attached to the lower surface thereof.

Next, the valve body 22 is subjected to an upstream force by the spring 24.

Further, a drain passage 18 is connected to the peripheral wall on the downstream side of the cylinder chamber 21.

Furthermore, a seat 25 is provided at the downstream outlet of the cylinder chamber 21.
A sealing material 26 on the lower surface of the valve body 22 is formed.
It is possible to come into close contact with.

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 user closes a start switch (not shown).

As a result, the water electromagnetic valve 7 is opened, and hot water (heated by the hot water heater 6) flows into the water channel 5.

The hot water passes through the hole 23 of the valve body 22, but at this time a pressure difference is generated between the upstream side and the downstream side of the valve body 22.

The pressure difference pushes the valve body 22 toward the downstream side against the spring 24.

As a result, the sealing material 26 on the lower surface of the valve body 22 comes into close contact with the seat 25 as shown in FIG.

Therefore, the drain passage 18 is connected to the water channel 5 by the valve body 22.
be cut off from

As a result, hot water flows into the bathtub 1 through the check valve 15 without being discharged into the drain path 18.

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, as the water pressure of the water supply source 4 decreases, the flow rate of hot water passing through the hole 23 of the valve body 22 decreases.

As a result, the pressure difference between the upstream side and the downstream side of the valve body 22 is reduced, and the valve body 22 is moved by the spring 2 as shown in FIG.
4, it is returned to the downstream side.

Therefore, the drain path 18 is connected to the water channel 5. Here, the diameter of the drain passage 18 is made sufficiently large.

Therefore, the backflow is discharged into the drain passage 18 which is open to the atmosphere.

That is, the water supply source 4 side is not open to the atmosphere and has a constant pressure, whereas the drain path 18 side is open to the atmosphere, so that the reverse flow is discharged to the drain path 18.

Therefore, when the check valve 15 is out of order, the backflow that passes through the check valve 15 is diverted to the drain path 18.
The water will not be discharged to the water supply source 4.

In other words, backflow in the water channel 5 is reliably prevented.

FIG. 4 shows another disconnection device of the device of the present invention,
The isolation device 16 has the following features compared to that of FIGS. 2 and 3.

That is, the valve body 22 is formed into a cylindrical shape so that it can fit into the seat 25 as shown in FIG. 5 when pushed downstream.

Other than the above-mentioned features, it is the same as that of FIGS. 2 and 3.

(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 claims for utility model registration, and in particular has a drain passage connected to the peripheral wall on the downstream side of the cylinder chamber, so even if the check valve malfunctions, backflow will not occur. It is discharged into the drain path, and backflow of the waterway is reliably prevented.

(2) The device of the present invention has the same configuration as above, and in particular, the valve body is moved by the pressure difference between the upstream side and the downstream side of the valve body to shut off and connect the drain path, so that the device is reliable in operation.

(3) The device of the present invention has the same configuration as above, and in particular, it reliably prevents backflow in waterways, so it can supply hot water (or water) to bathtubs etc. installed at high positions using only the water pressure of the water supply without using a pump. You can do it with confidence.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing an example of a waterway in which the device of the present invention is used, Fig. 2 is a longitudinal cross-sectional view of a shutoff device that constitutes the same device, and Fig. 3 is a usage state diagram of the cutoff device shown in Fig. 2. , FIG. 4 is a longitudinal sectional view of another shutoff device constituting the device of the present invention, and FIG. 5 is a diagram of the shutoff device of FIG. 4 in use. 1...Bathtub, 4...Water supply source, 5...Waterway, 6...
...Hot water heater, 7...Water solenoid valve, 15...Check valve, 16...Shutoff device, 18...Drain path, 20
... Main body, 21 ... Cylinder chamber, 22 ... Valve body, 23 ... Hole, 24 ... Spring, 25 ... Seat, 2
6...Sealing material, 27...Sealing material.

Claims (1)

[Scope of utility model registration request] A main body of a shutoff device that is attached to a waterway and has a cylinder chamber formed inside, a valve body that is slidably installed in the cylinder chamber, and a hole provided in the valve body that communicates the upstream side and the downstream side. a spring that applies a force to the upstream side on the valve body; a drain passage connected to a peripheral wall on the downstream side of the cylinder chamber; and a drain passage formed at a downstream outlet of the cylinder chamber to push the valve body downstream. A backflow prevention device for a waterway, comprising a seat that blocks the drain passage from the waterway when a water leak occurs, and a check valve installed in the waterway on the downstream side of the blocking device.